Remove ANIMATION_OWNERSHIP_TRANSFER guard.
Remove ANIMATION_OWNERSHIP_TRANSFER guard.

ANIMATION_OWNERSHIP_TRANSFER is a temporary macro to change addAnimation() in
both Blink and Chromium. Since Chromium synchronized this change, this guard can be
removed.

BUG=290217

Review URL: https://codereview.chromium.org/38903003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@160580 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs