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On Windows, hovering over the media controls triggers an ET_MOUSE_EXIT
MouseEvent. This is intended to only be caught when the mouse is
not within the video window bounds. On non-Windows, this is a noop.

Bug: 852131
Change-Id: I988d4483510c4eaafc9969edb26de407d77b0149
Reviewed-on: https://chromium-review.googlesource.com/1125139Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572402}