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When changing Ready Mode state from within an IE process, use chrome_launcher to invoke the ProcessLauncher, so as to not cause a UAC prompt (chrome_launcher is permitted via elevation policy).

BUG=None
TEST=Install GCF in Ready Mode on Vista, interact with it.
Review URL: http://codereview.chromium.org/6355011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72361 0039d316-1c4b-4281-b951-d872f2087c98