Revert of CC Animations: Enable external animation host for blink.

Revert of CC Animations: Enable external animation host for blink. (patchset #6 id:100001 of https://codereview.chromium.org/1308053006/ )

Reason for revert:
Breaks a number of tests across bots,

 http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux/builds/55219

Confirmed locally that reverting addresses the instability.

Original issue's description:
> CC Animations: Enable external animation host for blink.
>
> Depends on blink layout tests:
> https://codereview.chromium.org/1360233004/
>
> BUG=394777
>
> Committed: https://crrev.com/399f035cbbb4726b1a5fb3729d569dedaab7919e
> Cr-Commit-Position: refs/heads/master@{#352989}

TBR=ajuma@chromium.org,vollick@chromium.org,piman@chromium.org,loyso@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=394777
Committed: https://crrev.com/ef05b7da00844c0d500c4a7f20d4095dab56e7fe
Cr-Commit-Position: refs/heads/master@{#353020}

[sof, 2015-10-08 08:21:17]

Created Revert of CC Animations: Enable external animation host for blink.

[commit-bot: I haz the power, 2015-10-08 08:21:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1398713002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1398713002/1

[commit-bot: I haz the power, 2015-10-08 08:22:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-08 08:23:16]

Patchset 1 (id:??) landed as
https://crrev.com/ef05b7da00844c0d500c4a7f20d4095dab56e7fe
Cr-Commit-Position: refs/heads/master@{#353020}