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This reverts commit 37061f87.

Reason for revert:
The layout tests added by this CL is failing on the CL:
https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Win10/37804

Original change's description:
> Correctly initialize and test SnapContainerData in cc.
> 
> This patch initializes the rect_ field in SnapContainerData in copy
> constructor and move constructor. Fixing a snapping issue in the
> composited pages.
> 
> We also adds external/wpt/css/css-scroll-snap/ to the virtual/threaded
> test suite so that they are tested with the composited cases.
> 
> snap-at-user-scroll-end-manual-automation.js calls
> mouseClickInTarget() of pointerevent_common_input.js. That method
> invokes programmatic scrolls. The test was written before programmatic
> scroll snapping was implemented so it worked at that time. However,
> with programmatic scroll snapping implemented, it will always snap
> in mouseClickIntarget() and cannot test whether the user scroll snaps.
> This patch adds a parameter shouldScrollToTarget to mouseClickInTarget
> to avoid invoking programmatic scrolls in the test.
> 
> This patch also checks nullptr for layout_box in
> ScrollManager::SnapAtGestureScrollEnd() to fix a crash.
> 
> Bug: 862406, 862571
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
> Change-Id: I6a53818cf74421a4100ad6f908158abf302a5b8e
> Reviewed-on: https://chromium-review.googlesource.com/1132386
> Commit-Queue: Sandra Sun <sunyunjia@chromium.org>
> Reviewed-by: Majid Valipour <majidvp@chromium.org>
> Reviewed-by: Robert Flack <flackr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#574781}

TBR=flackr@chromium.org,majidvp@chromium.org,sunyunjia@chromium.org

Change-Id: I55c77c05c0381c8ac638bd106d2d18b1b4332745
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 862406, 862571
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Reviewed-on: https://chromium-review.googlesource.com/1136171Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574825}