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Needed to create new class, mimicking SimpleAPIPermission, as opposed to inheriting from SetDisjunctionPermission, since we just needed to construct strings dynamically with extension properties.

BUG=306128

Review URL: https://codereview.chromium.org/55533003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233394 0039d316-1c4b-4281-b951-d872f2087c98