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Also export WmMoveResizeHandler and do a few more minor cleanups.

R=sky@chromium.org

Bug: None
Change-Id: Ic627348b14d624641bf0adf6b30732e17f13b8f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348692
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797285}