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Without this, removing an animated view from a widget would stall the animation;
this could leave its state incorrect, e.g. if it was later re-added.  This can
affect the omnibox with an upcoming patch I'm writing.

This was introduced by http://crrev.com/657587 ; before that, AnimationRunner
did not exist, and removing a view from a widget would have no effect on
animations.

Bug: none
Change-Id: Iae457306a3a3f68e42772009a24d34dd65d4a144
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857191
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706612}