Fix schema for AutoCleanUpStrategy policy

The AutoCleanUpStrategy policy can take on one of two values. Both should
be listed in the schema.

BUG=306334
TEST=None

Review URL: https://codereview.chromium.org/136633003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244563 0039d316-1c4b-4281-b951-d872f2087c98

components/policy/resources/policy_templates.json

@@ -3436,9 +3436,7 @@
       'type': 'string-enum',
       'schema': {
         'type': 'string',
-        'enum': [
-          'remove-lru',
-        ],
+        'enum': [ 'remove-lru', 'remove-lru-if-dormant' ],
       },
       'items': [
         {