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This reverts commit 536be704.

Revert "Fix an issue that video is not seekable"

This reverts commit 21f1f757.

The first causes the tough_video_cases benchmark to hang and the
second depends on it. Details in bug.

BUG=412897
TBR=qinmin@chromium.org

Review URL: https://codereview.chromium.org/580673002

Cr-Commit-Position: refs/heads/master@{#295282}