Revert chromoting to use talk.google.com
Revert chromoting to use talk.google.com

Server certificate is not updated yet so revert the xmpp host used to prevent
failure.

TBR=ajwong, akalin

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/6531029

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@75262 0039d316-1c4b-4281-b951-d872f2087c98

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