Remove the unused video stuff in FilePlayer and FileRecorder

NOTRY=true

Review-Url: https://codereview.webrtc.org/2033433004
Cr-Original-Commit-Position: refs/heads/master@{#13260}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 821942d8b29b41778c3f03757d42112d6e9887c2
4 files changed