Re-enable all unit tests.

BUG=331940
TEST=manual

Review URL: https://codereview.chromium.org/134153012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246484 0039d316-1c4b-4281-b951-d872f2087c98
[GCM] Change GCMProfileService and GCM API functions to pass by const ref

BUG=284553
TEST=existing tests due to no new functionaility

Review URL: https://codereview.chromium.org/139093006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246485 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246485