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This allows enterprise-managed Kiosk Apps to mint OAuth2 access tokens
for the device-level robot account via the identity extension API.

BUG=chromium:224594

Review URL: https://chromiumcodereview.appspot.com/17009016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207835 0039d316-1c4b-4281-b951-d872f2087c98