[chromedriver] Reenable PerfTest.* now that reference chromedriver has been updated.

BUG=chromedriver:602
NOTRY=true

Review URL: https://codereview.chromium.org/71403003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236059 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236059