[Sheriff] Disable flaky MediaCodecPlayerTest.VideoReleaseWhileWaitingForSeek
[Sheriff] Disable flaky MediaCodecPlayerTest.VideoReleaseWhileWaitingForSeek

It failed twice in a few runs on "Android Tests (dbg)" (chromium.linux)

BUG=609444
TBR=qinmin@chromium.org

Review-Url: https://codereview.chromium.org/1949393002
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#391787}

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