Add code to load Hangout Services as a component extension.

Rename the extension from "Hangouts Services" to "Hangout Services".

Add public key and add ID to appropriate whitelists.

TBR=jochen@chromium.org
BUG=291271

Review URL: https://codereview.chromium.org/30833003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230693 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230693