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This reverts commit 5d5a062f.

Reason for revert: added a failing test https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Win10/32246 see issue 822386

bug: 822386

Original change's description:
> Send GSB before switching to mainthread scrolling in smooth scroll path.
> 
> This cl is the equivalent of https://codereview.chromium.org/2854683002 fix for smooth scrolling
> path,if the compositor handles the GSB and during the scrolling we have to switch to main thread
> since the compositor cannot handle a GSU a GSB must be sent to the main thread since the original
> GSB was handled on the compositor rather than being sent to the main thread.
> 
> touchpad-scroll-impl-to-main.html is the test that forces switch from compositor thread to main
> thread in the middle of scrolling. It used to get executed with --disable-smooth-scrolling
> in this cl I've moved the test to a new virtual test suite that has default scroll animation
> value.
> 
> I have removed the test expectations since I have changed the test and this might fix the flake.
> 
> subpixel-accumulation.html needs scroll animation to be disabled and that's why I had to move it to
> a new test suite.
> 
> Bug: 820979, 708499, 757165, 800840
> Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
> Change-Id: I21b1f4285897d74559f6827e6a232f007dc897b0
> Reviewed-on: https://chromium-review.googlesource.com/961264
> Commit-Queue: Sahel Sharifymoghaddam <sahel@chromium.org>
> Reviewed-by: Timothy Dresser <tdresser@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#543425}

TBR=tdresser@chromium.org,sahel@chromium.org

Change-Id: I3c5253d96d011c9723063effac91c969ee352305
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 820979, 708499, 757165, 800840
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Reviewed-on: https://chromium-review.googlesource.com/963388Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543467}