Revert "Reland "Show controls and update time indicators during seeking"""

This reverts commit 1db377b6c045dbc07f59fd8c6cb9fe99b08b6609.

Reason for revert: Implicated in causing webkit_layout_tests
virtual/video-surface-layer/media/controls-drag-timebar-rendering.html to fail.

https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Win10/47047

Original change's description:
> Reland "Show controls and update time indicators during seeking""
> 
> This commit relands f57001bcc79c30f2acc3be7bc47aee5e60bab10e.
> 
> > Show controls and update time indicators during seeking
> >
> > This commit modifies the MediaControls to show the controls and update
> > the current time indicators (current time text + timeline thumb)
> > immediately during seek requests so the element behavior during rapid
> > seek requests (e.g. user is holding down the FF button on their BT
> > keyboard) look similar to when a user is scrubbing the timeline with
> > their mouse.
> >
> > Bug: 748749
> >
> > TEST=MediaControlsImplTest, manual testing
> >      out/Debug/bin/run_webkit_unit_tests -f *MediaControlsImplTest*
> >
> > Change-Id: I6588aded2a93e081a6ca638ee1da534ea00abf4d
> > Reviewed-on: https://chromium-review.googlesource.com/c/1274945
> > Commit-Queue: Tommy Steimel <steimel@chromium.org>
> > Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> > Reviewed-by: Tommy Steimel <steimel@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#636493}
> 
> This commit was reverted due to causing a layout test to be flaky.
> 
> Additional testing:
>   python third_party/blink/tools/run_web_tests.py --seed 4
>     -t Release --repeat 30 media/controls-drag-timebar-rendering.html
> (same for virtual/video-surface-layer/media/... as well)
> 
> Updated controls-drag-timebar-rendering.html with an attempt to
> maintain the purpose of the test while updating it to allow the video
> to render the first couple frames in the 'actual' case.
> 
> Bug: 937029
> Change-Id: I4908d638800854ce6503e7629b3a0bd070aeadfa
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1506534
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> Commit-Queue: Tommy Steimel <steimel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#639072}

TBR=mlamouri@chromium.org,steimel@chromium.org,agdoug@amazon.com

Change-Id: Ieb91587129d32eee749ad719f4c89a70e3936abb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 937029
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1511826
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639144}
9 files changed