Revert "Drive SVG Animations via requestAnimationFrame"

This reverts commit 428bb7c6dc0c0cba317738e0a9bdaeb4bdb4bce6.

Suspected of causing various layout tests to fail, e.g.:
http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20ASAN/builds/12115

TBR=fs@opera.com
BUG=

Review URL: https://codereview.chromium.org/188903003

git-svn-id: svn://svn.chromium.org/blink/trunk@168674 bbb929c8-8fbe-4397-9dbb-9b2b20218538