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Revert of Split Screen mode implementation. (patchset #3 of https://codereview.chromium.org/461503002/)

Reason for revert:
Breaking "Linux Chromium OS ASan LSan Tests (3)" http://build.chromium.org/p/chromium.memory/builders/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%283%29/builds/2721

Original issue's description:
> Split Screen mode implementation.
> 
> Implements Split Screen mode and window cycling behavior.
> Resubmit of https://codereview.chromium.org/420603011/
> 
> TBR=oshima@chromium.org,mukai@chromium.org
> 
> BUG=383421
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289064

TBR=mukai@chromium.org,oshima@chromium.org,sadrul@chromium.org,mfomitchev@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=383421

Review URL: https://codereview.chromium.org/468053002

Cr-Commit-Position: refs/heads/master@{#289208}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289208 0039d316-1c4b-4281-b951-d872f2087c98