Simpler return value of HashTable::add/HashMap:add and others

Source/bindings/v8/DOMWrapperMap.h

Index: Source/bindings/v8/DOMWrapperMap.h
diff --git a/Source/bindings/v8/DOMWrapperMap.h b/Source/bindings/v8/DOMWrapperMap.h
index 09c25c817b86a881470992d857f3d491c91dfc89..0b4396fbf468f06d9aeea93dd04436f654a89931 100644
--- a/Source/bindings/v8/DOMWrapperMap.h
+++ b/Source/bindings/v8/DOMWrapperMap.h
@@ -91,8 +91,8 @@ public:
         ASSERT(result.isNewEntry);
         // FIXME: Stop handling this case once duplicate wrappers are guaranteed not to be created.
         if (!result.isNewEntry)
-            result.iterator->value.dispose();
-        result.iterator->value = UnsafePersistent<v8::Object>(persistent);
+            result.storedValue->value.dispose();
+        result.storedValue->value = UnsafePersistent<v8::Object>(persistent);
     }
 
     void clear()