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The method BoundsAnimator::CreateAnimation() is only overridden by a test
class that doesn't really need to do so. This CL removes the test subclass
and the virtual keyword from CreateAnimation().
This is a code clean up and has no change in behaviour.

Change-Id: I633f1163125cca423da4aff54ffafc0922bf0658
Reviewed-on: https://chromium-review.googlesource.com/895207Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533531}