Revert of Web Animations API: Add performance tests to WebKet/PerformanceTests/Animation (https://codereview.chromium.org/239623004/)

Reason for revert:
Times out on perf bots.

Example:
http://build.chromium.org/p/chromium.perf/builders/Linux%20Perf%20%281%29/builds/1187/steps/blink_perf/logs/stdio

Original issue's description:
> Web Animations API: Add performance tests to WebKet/PerformanceTests/Animation
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=174643

TBR=shans@chromium.org
NOTRY=True

Review URL: https://codereview.chromium.org/294243003

git-svn-id: svn://svn.chromium.org/blink/trunk@174704 bbb929c8-8fbe-4397-9dbb-9b2b20218538