Bug 496471 - Silence satchel warning about ORDER BY without an index since an index can't be used. r=dolske

toolkit/components/satchel/nsFormAutoComplete.js

@@ -242,7 +242,8 @@ FormAutoComplete.prototype = {
          * to reduce the amount of moving around by entries while typing.
          */
 
-        let query = "SELECT value, " +
+        let query = "/* do not warn (bug 496471): can't use an index */ " +
+                    "SELECT value, " +
                     "ROUND( " +
                         "timesUsed / MAX(1.0, (lastUsed - firstUsed) / :timeGroupingSize) * " +
                         "MAX(1.0, :maxTimeGroupings - (:now - lastUsed) / :timeGroupingSize) * "+