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Follow-up CLs will make the host respect this policy, and will let Windows
and Mac builds read this string-valued policy.

BUG=132684


Review URL: https://chromiumcodereview.appspot.com/10816036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148871 0039d316-1c4b-4281-b951-d872f2087c98