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Do not call Button::OnGestureEvent if the event has been handled by the
FrameCaptionButton. FrameCaptionButton may handle
ui::ET_GESTURE_SCROLL_END by invoking click handler, which, depending on
the button implementation, may end up deleting the button, so continuing
to process the event is not safe.

BUG=1142568

Change-Id: I6ba6099beff577026a90e749b99430c5819099a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602600Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839483}