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This reverts commit 6aac2af3.

Reason for revert: Caused breakage of mash test. See https://crbug.com/902870.

Original change's description:
> MojoVideoDecoder: Add histogram to track initialization and error.
> 
> The autotest video_ChromeHWDecodeUsed verifies Chrome used the HW
> decoding when playing a video stream by checking the histogram value,
> which is reported from GpuVideoDecoder.
> In order to keep the test pass during switching from GpuVideoDecoder
> to MojoVideoDecoder, we have to report the same histogram value
> temporarily from MojoVideoDecoder.
> 
> With this CL, we can enable MojoVideoDecoder at ChromeOS platform.
> 
> BUG=chromium:902968
> TEST=Pass video_ChromeHWDecodeUsed autotest on Eve
> TEST=Play video at Youtube on Eve and confirm the successfull option
>      of Media.GpuVideoDecoderInitializeStatus are increased.
> 
> Change-Id: I26fc53704843e9b153bbee304e8f60ab3a7b0417
> Reviewed-on: https://chromium-review.googlesource.com/c/1328634
> Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
> Reviewed-by: Dan Sanders <sandersd@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#607890}

TBR=posciak@chromium.org,sandersd@chromium.org,akahuang@chromium.org,hiroh@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:902968
Change-Id: I3b74c752b6cc34dcbcba203eeb39707f4921d405
Reviewed-on: https://chromium-review.googlesource.com/c/1340378Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608874}