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We cannot animate opacity on a layer with blur, the result is that
the blur will dissapear while the opacity is animating. This appears
visually as a 'snap' away of the blur effect.

Because this opacity animation is happening so quickly, just make it
animate instantly to prevent the blur snapping away. (preferred by UX.)

Also remove an un-used function, and some stale header includes.

Bug: 956187
Change-Id: I24480bab1b2ef377c253047ac5748c03e215ee81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584927Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Auto-Submit: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654622}