Revert of Add some performance testing for paint invalidations (https://codereview.chromium.org/450813002/)

Reason for revert:
Timing out on perf bots. One example:
http://chromegw/i/chromium.perf/builders/Linux%20Perf%20%281%29/builds/2268/steps/blink_perf/logs/stdio

Original issue's description:
> Add some performance testing for paint invalidations
> 
> After moving paint invalidations after compositing updates, we
> lost most of the performance coverage we had as most performance
> tests trigger layout without generating a frame.
> 
> The new cases are DRT specific as we use
> Internals.forceCompositingUpdate. This is required as rAF
> will cap the tests to the sync frequency.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179881

TBR=dsinclair@chromium.org,esprehn@chromium.org,leviw@chromium.org,xianxianzhu@chromium.org,jchaffraix@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/459663002

git-svn-id: svn://svn.chromium.org/blink/trunk@179886 bbb929c8-8fbe-4397-9dbb-9b2b20218538