Re-enable ServiceProcessControlBrowserTest.LaunchAndIPC

BUG=70076,304715

Review URL: https://codereview.chromium.org/26292005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227683 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227683