Support service accounts in the chromoting host.
This change allows running a host *already configured* with service account credentials. Support for obtaining service account credentails during host setup will come in follow up CLs. BUG=224742 Review URL: https://chromiumcodereview.appspot.com/19796006 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@217941 0039d316-1c4b-4281-b951-d872f2087c98
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