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This reverts commit 1f31a184.

Reason for revert: "WebMediaPlayerMSTest.StopsCreatingHardwareFramesWhenHiddenOrClosed" is flaky. https://bugs.chromium.org/p/chromium/issues/detail?id=821839

Original change's description:
> Stop using GpuMemoryBufferVideoFramePool when WebMediaPlayerMS is hidden
> 
> This CL adds calls to track when WebMediaPlayerMS is hidden or shown, so
> that in the time period we can skip creating GMB backed frames. For that
> time period, frames aren't going to be displayed, so copying them to GMBs
> is extra work which should be avoided.
> 
> Bug: 653200
> Change-Id: I67e55c7f1150b434d82321ac90a08c7c3e3e6336
> Reviewed-on: https://chromium-review.googlesource.com/954339
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Reviewed-by: Dan Sanders <sandersd@chromium.org>
> Commit-Queue: Emircan Uysaler <emircan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542950}

TBR=sandersd@chromium.org,dcastagna@chromium.org,emircan@chromium.org

Change-Id: Ib88d6f0419271bf7d5e65b1b017eef1e12aeecbb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 653200
Reviewed-on: https://chromium-review.googlesource.com/962824Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543118}