Remove unused suspend/resume for timers and animations.

These hooks were added for WebKit2 in r109548 but are unused in
Chromium.

Review URL: https://codereview.chromium.org/14103015

git-svn-id: svn://svn.chromium.org/blink/trunk@148415 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove remnants of unused animation API.

These were part of a non-standard animation API added in r80846 and removed
in r137243.

Review URL: https://codereview.chromium.org/13935007

git-svn-id: svn://svn.chromium.org/blink/trunk@148420 bbb929c8-8fbe-4397-9dbb-9b2b20218538