Remove tests using the default codec (i.e. VP8) from chrome_webrtc_perf_browsertest.cc and chrome_webrtc_video_quality_browsertest.cc.

The tests have been replaced by:
- WebRtcPerfBrowserTest.MANUAL_RunsAudioVideoCall60SecsAndLogsInternalMetricsVp8
- WebRtcVideoQualityBrowserTest.MANUAL_TestVideoQualityVp8

BUG=chromium:554512

Review URL: https://codereview.chromium.org/1817983002

Cr-Commit-Position: refs/heads/master@{#382283}
2 files changed