Revert 228993 "Disable tab capture perf tests on Aura."

> Disable tab capture perf tests on Aura.
> 
> This was recently re-enabled, but is failing on the Windows (Aura) GPU
> bots.
> 
> TBR=hubbe@chromium.org
> BUG=308236
> 
> Review URL: https://codereview.chromium.org/27537006

TBR=ccameron@chromium.org

Review URL: https://codereview.chromium.org/27613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229002 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229002