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UI for the consent prompt is not ready yet but we want a way to perform an
end-to-end integration test.  This allows the consent to be explicitly given
on the command line.

BUG=chromium:270316
TEST=unit, manual

Review URL: https://chromiumcodereview.appspot.com/23470003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221747 0039d316-1c4b-4281-b951-d872f2087c98