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It's needed for crbug.com/874510.
Since we have different WindowResizer for laptop mode and tablet mode,
and they will have different behavior for fling/swipe events, we should
let WindowResizer to do the fling/swipe event handling. So move the
logic to WindowResizer.

No functionality is changed in this CL. I'll add special logic for
tablet mode window fling/swipe in a following-up CL.

Bug: 874510
Change-Id: I91b917e8ec947681db12d5be8b8c8b982299af9a
Reviewed-on: https://chromium-review.googlesource.com/c/1262457
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597380}