Add hangouts id's to the hangoutsPrivate API whitelist.
This CL adds the permissions and handling code for the hangouts extension id's for the various releases.

Reviews requested,
extension parts: asargent@
people search parts: xiyuan@

R=asargent@chromium.org,xiyuan@chromium.org
BUG=309737

Review URL: https://codereview.chromium.org/33823003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230104 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230104