Remove WEB_ANIMATION_SUPPORTS_FULL_DIRECTION define
Remove WEB_ANIMATION_SUPPORTS_FULL_DIRECTION define

This is the 4th and last part of accelerated direction control.

Now that legacy path in compositor has been removed, the
WEB_ANIMATION_SUPPORTS_FULL_DIRECTION define becomes unneeded.

It builds on top of https://codereview.chromium.org/227733004,
https://codereview.chromium.org/225183014 and
https://codereview.chromium.org/576553002/

BUG=348071

Review URL: https://codereview.chromium.org/572363002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@182101 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