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components/infobars/core/infobar is a AnimationDelegate but this can't use
AnimationDelegateViews or get widget as it would be layering violation.

So it's subclass, InfoBarView sets AnimationDelegateNotifier with AnimationDelegateViews. AnimationDelegateViews will adapt CompositorAnimationRunner for InfoBar and then forward callbacks to InfoBar.

There's no intentional behavior changes.

Bug: 824026
Change-Id: Id824a6a402682e9ec5a0f36216d92d92cffa5669
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933839Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721507}