Bug 743559 - Remove unused JSRuntime::xml_singleton fields. r=:Waldo

The patch removes unused  anynameObject and functionNamespaceObject fields in JSRuntime.

js/src/jsapi.cpp

@@ -781,8 +781,6 @@ JSRuntime::JSRuntime()
     thousandsSeparator(0),
     decimalSeparator(0),
     numGrouping(0),
-    anynameObject(NULL),
-    functionNamespaceObject(NULL),
     waiveGCQuota(false),
     dtoaState(NULL),
     pendingProxyOperation(NULL),

js/src/jscntxt.h

@@ -566,16 +566,6 @@ struct JSRuntime : js::RuntimeFriendFields
     const char          *decimalSeparator;
     const char          *numGrouping;
 
-    /*
-     * Weak references to lazily-created, well-known XML singletons.
-     *
-     * NB: Singleton objects must be carefully disconnected from the rest of
-     * the object graph usually associated with a JSContext's global object,
-     * including the set of standard class objects.  See jsxml.c for details.
-     */
-    JSObject            *anynameObject;
-    JSObject            *functionNamespaceObject;
-
     /*
      * Flag indicating that we are waiving any soft limits on the GC heap
      * because we want allocations to be infallible (except when we hit OOM).