[Caja] add missing Date methods in es53 (issue 5699094)

[felix8a]

Reviewers: metaweta, Jasvir,

Description:
es53.js is missing some UTC Date methods that are in the es5 spec.
this adds them.

in particular, toUTCString is needed by jquery.cookie.js

Please review this at http://codereview.appspot.com/5699094/

Affected files:
  M     src/com/google/caja/es53.js


Index: src/com/google/caja/es53.js
===================================================================
--- src/com/google/caja/es53.js (revision 4788)
+++ src/com/google/caja/es53.js (working copy)
@@ -3912,14 +3912,22 @@
         'getUTCFullYear',
         'getMilliseconds',
         'getTimezoneOffset',
+        'setTime',
+        'setMilliseconds',
+        'setUTCMilliseconds',
+        'setSeconds',
+        'setUTCSeconds',
+        'setMinutes',
+        'setUTCMinutes',
+        'setHours',
+        'setUTCHours',
+        'setDate',
+        'setUTCDate',
+        'setMonth',
+        'setUTCMonth',
         'setFullYear',
-        'setMonth',
-        'setDate',
-        'setHours',
-        'setMinutes',
-        'setSeconds',
-        'setMilliseconds',
-        'setTime',
+        'setUTCFullYear',
+        'toUTCString',
         'toISOString',
         'toJSON'
       ];