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This helper method can be used to determine if a policy comes from the
profile cloud policy provider or from another source. It will be used
to determine the source of the Managed Bookmarks policy and set the
folder name accordingly.

BUG=49598

Review URL: https://codereview.chromium.org/304183007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274142 0039d316-1c4b-4281-b951-d872f2087c98