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Currently the WmGestureHandler handles events for the wm and also the
window cycle list. There is also the WindowCycleEventFilter which
handles some events for the window cycle list. This was implemented
like this to share logic for scrolling, but after further investigation
the common logic has been determined to not warrant having the handling
for the window cycle list to live in two separate event handlers.

This CL refactors the WmGestureHandler, moving all window cycle list
logic to the WindowCycleEventFilter.

A followup CL will refactor the WindowCycleEventFilter to reorder fcns
according to order in its header file.

Test: manual + existing tests.
Bug: 1136554
Change-Id: I055d0533169992ad1022bdd14da9ce89d91f7e5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606494Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Jeremy Chinsen <chinsenj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842584}