Layout Test fast/animation/request-animation-frame-timestamps-advance.html is failing

Layout Test fast/animation/request-animation-frame-timestamps-advance.html is failing
https://bugs.webkit.org/show_bug.cgi?id=68821

Switch test to use finishJSTest(), which handles js-test-post.js loading
after the test is complete better.

* fast/animation/request-animation-frame-timestamps-advance.html:
* fast/animation/script-tests/request-animation-frame-timestamps-advance.js:
(window.webkitRequestAnimationFrame):
* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95987 268f45cc-cd09-0410-ab3c-d52691b4dbfc