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This CL removes the setup of WindowEventFilter in the DWTHX11
and uses the one already implemented in the DWTHPlatform.

However, to make move/resize work with non-Ozone X11, the
WMResizeHandler is subclassed by the X11Window instead of
X11WindowOzone now.

Bug: 990756
Change-Id: I9e95bf56adcf21267246c45264d8a801ee9f45cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1776027
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696733}