diff --git a/media/BUILD.gn b/media/BUILD.gn
index 794f7a1e32..2a05940b1d 100644
--- a/media/BUILD.gn
+++ b/media/BUILD.gn
@@ -720,8 +720,8 @@ if (rtc_build_dcsctp) {
       ":media_channel",
       ":rtc_data_sctp_transport_internal",
       "../api:array_view",
-      "../api/environment",
       "../api:libjingle_peerconnection_api",
+      "../api/environment",
       "../api/task_queue:pending_task_safety_flag",
       "../api/task_queue:task_queue",
       "../net/dcsctp/public:factory",
@@ -812,7 +812,6 @@ if (rtc_include_tests) {
       "../api/environment",
       "../api/task_queue",
       "../api/task_queue:pending_task_safety_flag",
-      "../api/transport:field_trial_based_config",
       "../api/units:timestamp",
       "../api/video:encoded_image",
       "../api/video:video_bitrate_allocation",
@@ -844,7 +843,6 @@ if (rtc_include_tests) {
       "../rtc_base:timeutils",
       "../rtc_base/synchronization:mutex",
       "../rtc_base/third_party/sigslot",
-      "../test:scoped_key_value_config",
       "../test:test_support",
       "../video/config:streams_config",
       "//testing/gtest",
diff --git a/media/engine/fake_webrtc_call.cc b/media/engine/fake_webrtc_call.cc
index 2536c9dd85..8ca7880782 100644
--- a/media/engine/fake_webrtc_call.cc
+++ b/media/engine/fake_webrtc_call.cc
@@ -16,6 +16,7 @@
 #include "absl/algorithm/container.h"
 #include "absl/strings/string_view.h"
 #include "api/call/audio_sink.h"
+#include "api/environment/environment.h"
 #include "api/units/timestamp.h"
 #include "call/packet_receiver.h"
 #include "media/base/media_channel.h"
@@ -27,6 +28,7 @@
 
 namespace cricket {
 
+using ::webrtc::Environment;
 using ::webrtc::ParseRtpSsrc;
 
 FakeAudioSendStream::FakeAudioSendStream(
@@ -144,9 +146,11 @@ void FakeAudioReceiveStream::SetGain(float gain) {
 }
 
 FakeVideoSendStream::FakeVideoSendStream(
+    const Environment& env,
     webrtc::VideoSendStream::Config config,
     webrtc::VideoEncoderConfig encoder_config)
-    : sending_(false),
+    : env_(env),
+      sending_(false),
       config_(std::move(config)),
       codec_settings_set_(false),
       resolution_scaling_enabled_(false),
@@ -256,7 +260,8 @@ void FakeVideoSendStream::OnFrame(const webrtc::VideoFrame& frame) {
               encoder_config_.video_format.name, encoder_config_.max_qp,
               encoder_config_.content_type ==
                   webrtc::VideoEncoderConfig::ContentType::kScreen,
-              encoder_config_.legacy_conference_mode, encoder_info);
+              encoder_config_.legacy_conference_mode, encoder_info,
+              absl::nullopt, &env_.field_trials());
 
       video_streams_ = factory->CreateEncoderStreams(
           frame.width(), frame.height(), encoder_config_);
@@ -444,19 +449,19 @@ void FakeFlexfecReceiveStream::OnRtpPacket(const webrtc::RtpPacketReceived&) {
   RTC_DCHECK_NOTREACHED() << "Not implemented.";
 }
 
-FakeCall::FakeCall(webrtc::test::ScopedKeyValueConfig* field_trials)
-    : FakeCall(rtc::Thread::Current(), rtc::Thread::Current(), field_trials) {}
+FakeCall::FakeCall(const Environment& env)
+    : FakeCall(env, rtc::Thread::Current(), rtc::Thread::Current()) {}
 
-FakeCall::FakeCall(webrtc::TaskQueueBase* worker_thread,
-                   webrtc::TaskQueueBase* network_thread,
-                   webrtc::test::ScopedKeyValueConfig* field_trials)
-    : network_thread_(network_thread),
+FakeCall::FakeCall(const Environment& env,
+                   webrtc::TaskQueueBase* worker_thread,
+                   webrtc::TaskQueueBase* network_thread)
+    : env_(env),
+      network_thread_(network_thread),
       worker_thread_(worker_thread),
       audio_network_state_(webrtc::kNetworkUp),
       video_network_state_(webrtc::kNetworkUp),
       num_created_send_streams_(0),
-      num_created_receive_streams_(0),
-      trials_(field_trials ? field_trials : &fallback_trials_) {}
+      num_created_receive_streams_(0) {}
 
 FakeCall::~FakeCall() {
   EXPECT_EQ(0u, video_send_streams_.size());
@@ -574,8 +579,8 @@ void FakeCall::DestroyAudioReceiveStream(
 webrtc::VideoSendStream* FakeCall::CreateVideoSendStream(
     webrtc::VideoSendStream::Config config,
     webrtc::VideoEncoderConfig encoder_config) {
-  FakeVideoSendStream* fake_stream =
-      new FakeVideoSendStream(std::move(config), std::move(encoder_config));
+  FakeVideoSendStream* fake_stream = new FakeVideoSendStream(
+      env_, std::move(config), std::move(encoder_config));
   video_send_streams_.push_back(fake_stream);
   ++num_created_send_streams_;
   return fake_stream;
diff --git a/media/engine/fake_webrtc_call.h b/media/engine/fake_webrtc_call.h
index d67a7ee452..9a6bc0a246 100644
--- a/media/engine/fake_webrtc_call.h
+++ b/media/engine/fake_webrtc_call.h
@@ -27,7 +27,7 @@
 #include <vector>
 
 #include "absl/strings/string_view.h"
-#include "api/transport/field_trial_based_config.h"
+#include "api/environment/environment.h"
 #include "api/video/video_frame.h"
 #include "call/audio_receive_stream.h"
 #include "call/audio_send_stream.h"
@@ -38,7 +38,6 @@
 #include "call/video_send_stream.h"
 #include "modules/rtp_rtcp/source/rtp_packet_received.h"
 #include "rtc_base/buffer.h"
-#include "test/scoped_key_value_config.h"
 
 namespace cricket {
 class FakeAudioSendStream final : public webrtc::AudioSendStream {
@@ -158,7 +157,8 @@ class FakeVideoSendStream final
     : public webrtc::VideoSendStream,
       public rtc::VideoSinkInterface<webrtc::VideoFrame> {
  public:
-  FakeVideoSendStream(webrtc::VideoSendStream::Config config,
+  FakeVideoSendStream(const webrtc::Environment& env,
+                      webrtc::VideoSendStream::Config config,
                       webrtc::VideoEncoderConfig encoder_config);
   ~FakeVideoSendStream() override;
   const webrtc::VideoSendStream::Config& GetConfig() const;
@@ -215,6 +215,7 @@ class FakeVideoSendStream final
   void ReconfigureVideoEncoder(webrtc::VideoEncoderConfig config,
                                webrtc::SetParametersCallback callback) override;
 
+  const webrtc::Environment env_;
   bool sending_;
   webrtc::VideoSendStream::Config config_;
   webrtc::VideoEncoderConfig encoder_config_;
@@ -363,10 +364,10 @@ class FakeFlexfecReceiveStream final : public webrtc::FlexfecReceiveStream {
 
 class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
  public:
-  explicit FakeCall(webrtc::test::ScopedKeyValueConfig* field_trials = nullptr);
-  FakeCall(webrtc::TaskQueueBase* worker_thread,
-           webrtc::TaskQueueBase* network_thread,
-           webrtc::test::ScopedKeyValueConfig* field_trials = nullptr);
+  explicit FakeCall(const webrtc::Environment& env);
+  FakeCall(const webrtc::Environment& env,
+           webrtc::TaskQueueBase* worker_thread,
+           webrtc::TaskQueueBase* network_thread);
   ~FakeCall() override;
 
   webrtc::MockRtpTransportControllerSend* GetMockTransportControllerSend() {
@@ -406,14 +407,10 @@ class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
 
   void SetClientBitratePreferences(
       const webrtc::BitrateSettings& preferences) override {}
-
-  void SetFieldTrial(const std::string& field_trial_string) {
-    trials_overrides_ = std::make_unique<webrtc::test::ScopedKeyValueConfig>(
-        *trials_, field_trial_string);
+  const webrtc::FieldTrialsView& trials() const override {
+    return env_.field_trials();
   }
 
-  const webrtc::FieldTrialsView& trials() const override { return *trials_; }
-
  private:
   webrtc::AudioSendStream* CreateAudioSendStream(
       const webrtc::AudioSendStream::Config& config) override;
@@ -480,6 +477,7 @@ class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
                          absl::string_view sync_group) override;
   void OnSentPacket(const rtc::SentPacket& sent_packet) override;
 
+  const webrtc::Environment env_;
   webrtc::TaskQueueBase* const network_thread_;
   webrtc::TaskQueueBase* const worker_thread_;
 
@@ -502,16 +500,6 @@ class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
 
   int num_created_send_streams_;
   int num_created_receive_streams_;
-
-  // The field trials that are in use, either supplied by caller
-  // or pointer to &fallback_trials_.
-  webrtc::test::ScopedKeyValueConfig* trials_;
-
-  // fallback_trials_ is used if caller does not provide any field trials.
-  webrtc::test::ScopedKeyValueConfig fallback_trials_;
-
-  // An extra field trial that can be set using SetFieldTrial.
-  std::unique_ptr<webrtc::test::ScopedKeyValueConfig> trials_overrides_;
 };
 
 }  // namespace cricket
diff --git a/media/engine/webrtc_video_engine_unittest.cc b/media/engine/webrtc_video_engine_unittest.cc
index 403d58a2e9..ca69dcabbf 100644
--- a/media/engine/webrtc_video_engine_unittest.cc
+++ b/media/engine/webrtc_video_engine_unittest.cc
@@ -747,7 +747,7 @@ TEST_F(WebRtcVideoEngineTest, CanConstructDecoderForVp9EncoderFactory) {
 
 TEST_F(WebRtcVideoEngineTest, PropagatesInputFrameTimestamp) {
   AddSupportedVideoCodecType("VP8");
-  FakeCall* fake_call = new FakeCall();
+  FakeCall* fake_call = new FakeCall(env_);
   call_.reset(fake_call);
   auto send_channel = SetSendParamsWithAllSupportedCodecs();
 
@@ -1476,7 +1476,7 @@ TEST(WebRtcVideoEngineNewVideoCodecFactoryTest, Vp8) {
 
 TEST_F(WebRtcVideoEngineTest, DISABLED_RecreatesEncoderOnContentTypeChange) {
   encoder_factory_->AddSupportedVideoCodecType("VP8");
-  std::unique_ptr<FakeCall> fake_call(new FakeCall());
+  auto fake_call = std::make_unique<FakeCall>(env_);
   auto send_channel = SetSendParamsWithAllSupportedCodecs();
 
   ASSERT_TRUE(
@@ -2622,7 +2622,7 @@ class WebRtcVideoChannelTest : public WebRtcVideoEngineTest {
     AddSupportedVideoCodecType("H264");
 #endif
 
-    fake_call_.reset(new FakeCall(&field_trials_));
+    fake_call_ = std::make_unique<FakeCall>(env_);
     send_channel_ = engine_.CreateSendChannel(
         fake_call_.get(), GetMediaConfig(), VideoOptions(),
         webrtc::CryptoOptions(), video_bitrate_allocator_factory_.get());
@@ -9489,7 +9489,7 @@ TEST_F(WebRtcVideoChannelTest, GenerateKeyFrameSimulcast) {
 class WebRtcVideoChannelSimulcastTest : public ::testing::Test {
  public:
   WebRtcVideoChannelSimulcastTest()
-      : fake_call_(),
+      : fake_call_(CreateEnvironment(&field_trials_)),
         encoder_factory_(new cricket::FakeWebRtcVideoEncoderFactory),
         decoder_factory_(new cricket::FakeWebRtcVideoDecoderFactory),
         mock_rate_allocator_factory_(
diff --git a/media/engine/webrtc_voice_engine_unittest.cc b/media/engine/webrtc_voice_engine_unittest.cc
index d5efbca9d9..852abd9ddf 100644
--- a/media/engine/webrtc_voice_engine_unittest.cc
+++ b/media/engine/webrtc_voice_engine_unittest.cc
@@ -195,13 +195,13 @@ class WebRtcVoiceEngineTestFake : public ::testing::TestWithParam<bool> {
  public:
   WebRtcVoiceEngineTestFake()
       : use_null_apm_(GetParam()),
-        task_queue_factory_(webrtc::CreateDefaultTaskQueueFactory()),
+        env_(CreateEnvironment(&field_trials_)),
         adm_(webrtc::test::MockAudioDeviceModule::CreateStrict()),
         apm_(use_null_apm_
                  ? nullptr
                  : rtc::make_ref_counted<
                        StrictMock<webrtc::test::MockAudioProcessing>>()),
-        call_(&field_trials_) {
+        call_(env_) {
     // AudioDeviceModule.
     AdmSetupExpectations(adm_.get());
 
@@ -220,9 +220,9 @@ class WebRtcVoiceEngineTestFake : public ::testing::TestWithParam<bool> {
     // factories. Those tests should probably be moved elsewhere.
     auto encoder_factory = webrtc::CreateBuiltinAudioEncoderFactory();
     auto decoder_factory = webrtc::CreateBuiltinAudioDecoderFactory();
-    engine_.reset(new cricket::WebRtcVoiceEngine(
-        task_queue_factory_.get(), adm_.get(), encoder_factory, decoder_factory,
-        nullptr, apm_, nullptr, field_trials_));
+    engine_ = std::make_unique<cricket::WebRtcVoiceEngine>(
+        &env_.task_queue_factory(), adm_.get(), encoder_factory,
+        decoder_factory, nullptr, apm_, nullptr, env_.field_trials());
     engine_->Init();
     send_parameters_.codecs.push_back(kPcmuCodec);
     recv_parameters_.codecs.push_back(kPcmuCodec);
@@ -846,7 +846,7 @@ class WebRtcVoiceEngineTestFake : public ::testing::TestWithParam<bool> {
   rtc::AutoThread main_thread_;
   const bool use_null_apm_;
   webrtc::test::ScopedKeyValueConfig field_trials_;
-  std::unique_ptr<webrtc::TaskQueueFactory> task_queue_factory_;
+  const Environment env_;
   rtc::scoped_refptr<webrtc::test::MockAudioDeviceModule> adm_;
   rtc::scoped_refptr<StrictMock<webrtc::test::MockAudioProcessing>> apm_;
   cricket::FakeCall call_;
diff --git a/pc/rtp_sender_receiver_unittest.cc b/pc/rtp_sender_receiver_unittest.cc
index 4387aedf53..259b2d26fd 100644
--- a/pc/rtp_sender_receiver_unittest.cc
+++ b/pc/rtp_sender_receiver_unittest.cc
@@ -25,6 +25,7 @@
 #include "api/crypto/frame_decryptor_interface.h"
 #include "api/crypto/frame_encryptor_interface.h"
 #include "api/dtmf_sender_interface.h"
+#include "api/environment/environment_factory.h"
 #include "api/media_stream_interface.h"
 #include "api/rtc_error.h"
 #include "api/rtc_event_log/rtc_event_log.h"
@@ -109,7 +110,7 @@ class RtpSenderReceiverTest
         // Create fake media engine/etc. so we can create channels to use to
         // test RtpSenders/RtpReceivers.
         media_engine_(std::make_unique<cricket::FakeMediaEngine>()),
-        fake_call_(worker_thread_, network_thread_),
+        fake_call_(CreateEnvironment(), worker_thread_, network_thread_),
         local_stream_(MediaStream::Create(kStreamId1)) {
     rtp_dtls_transport_ = std::make_unique<cricket::FakeDtlsTransport>(
         "fake_dtls_transport", cricket::ICE_CANDIDATE_COMPONENT_RTP);
diff --git a/video/video_receive_stream2_unittest.cc b/video/video_receive_stream2_unittest.cc
index f4802e45fa..5e0f1f07c5 100644
--- a/video/video_receive_stream2_unittest.cc
+++ b/video/video_receive_stream2_unittest.cc
@@ -199,6 +199,7 @@ class VideoReceiveStream2Test : public ::testing::TestWithParam<bool> {
         config_(&mock_transport_, &mock_h264_decoder_factory_),
         call_stats_(&env_.clock(), time_controller_.GetMainThread()),
         fake_renderer_(&time_controller_),
+        fake_call_(env_),
         fake_metronome_(TimeDelta::Millis(16)),
         decode_sync_(&env_.clock(),
                      &fake_metronome_,