When converting from a .y4m file, it's illegal to pass a video_size option since the resolution is already contained in the .y4m file. TBR=phoglund@webrtc.org NOTRY=TRUE Bug: webrtc:9642 Change-Id: Iee7d2ba1332c45a1669af0fba43b0c3e7ce5846b Reviewed-on: https://webrtc-review.googlesource.com/95949 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Commit-Queue: Magnus Jedvert <magjed@webrtc.org> Cr-Commit-Position: refs/heads/master@{#24431}