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This reverts commit e5196986 with fixes in media/cast/sender/h264_vt_encoder_unittest.cc

TBR=dalecurtis@chromium.org,watk@chromium.org,bbudge@chromium.org
BUG=126070,332204
TEST=Updated unittests.

Review URL: https://codereview.chromium.org/1143223007

Cr-Commit-Position: refs/heads/master@{#333178}