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OverlayWindowViews handled KeyEvents as a workaround for a11y
navigation. Now that the buttons are tab navigable, this is no longer
needed.

OnKeyEvent() also causes some issues if the initially focused button
on the window is the close button, rather than play/pause. This is
determined by the built in view::Views keyboard navigation. Keeping
track of this separately in OverlayWindowViews makes no sense.

Change-Id: Ide8cca038452781790d2d80a9545f1a2a7b474e9
Reviewed-on: https://chromium-review.googlesource.com/1136228Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575367}