Revert 230006 "Fix and re-enable the tab_capture_performance_tes..."

> Fix and re-enable the tab_capture_performance_tests for AURA and MAC.
> There are two fixes in here:
> 
> 1. The test framework doesn't terminate if there is no idle time, so make sure that
>    idle time is created by stopping capturing and animation.
> 
> 2. Aura generates unexpected tracing events. Basically, it looks like it's using the
>    GPU even when it doesn't. Disable the check that tries to assert that we're using
>    software when we ask for software and vice versa.
> 
> BUG=308236
> 
> Review URL: https://codereview.chromium.org/29633002

TBR=hubbe@chromium.org

Review URL: https://codereview.chromium.org/32583005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230021 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230021