Bug 666549 - Don't delete empty ObjectValueMaps in WeakMaps. r=igor

js/src/jsweakmap.cpp

@@ -240,15 +240,8 @@ WeakMap_set(JSContext *cx, uintN argc, Value *vp)
 static void
 WeakMap_mark(JSTracer *trc, JSObject *obj)
 {
-    ObjectValueMap *map = GetObjectMap(obj);
-    if (map) {
-        if (IS_GC_MARKING_TRACER(trc) && map->empty()) {
-            trc->context->delete_(map);
-            obj->setPrivate(NULL);
-        } else {
-            map->trace(trc);
-        }
-    }
+    if (ObjectValueMap *map = GetObjectMap(obj))
+        map->trace(trc);
 }
 
 static void