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This cleanup CL removes views::X11WindowEventFilter class in favor of generic
views::WindowEventFilter by modifying DesktopWindowTreeHostX11 to implement
WmMoveResizeHandler interface. As part of Aura/X11 => Ozone/X11 migration, this
makes non-client event handling in DWTHX11 more like DWTHPlatform as well as
removes one more unneeded usage of Event::native_event() which contributes to
X11 PlatformEvent migration sub-task.

Bug: 965991
Test: Covered by tests (no behavioral change).
Change-Id: Ie4a6457a2c4b68a09cb3b5622c65b736d2d490eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772537Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#691298}