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This CL removes that attributes. It also adds a gesture scroll bubbling
case to ensure that the behavior is correct.

Due to our previous temporary fix, we set |scrolling_touch_action_| to
Auto at GSB if it has no value. To prove that this CL is actually working,
we do:
PS#1: remove the set |scrolling_touch_action_| to Auto at GSB, and
the test will crash.
PS#2: Keep 1, add a line in CrossProcessFrameConnector::BubbleScrollEvent
which sets the |scrolling_touch_action_| to Auto. The test will pass.
PS#3: Keep the temporary fix which sets |scrolling_touch_action_| to
Auto at GSB.

TBR=pdr@chromium.org

Bug: 852835, 841270
Change-Id: Ib33a39b4b0ef61e88645da427b920687bbcc80c9
Reviewed-on: https://chromium-review.googlesource.com/1101315
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568281}