Make DOMWrapperWorld::current() return a reference instead of a pointer

Source/bindings/v8/DOMDataStore.h

Index: Source/bindings/v8/DOMDataStore.h
diff --git a/Source/bindings/v8/DOMDataStore.h b/Source/bindings/v8/DOMDataStore.h
index c45034c633bd67250b3f1403fd139043df15d68c..a1a93b57cb628e5eecb9b17b1685d1ec4fd525d2 100644
--- a/Source/bindings/v8/DOMDataStore.h
+++ b/Source/bindings/v8/DOMDataStore.h
@@ -74,7 +74,7 @@ public:
         if (holderContainsWrapper(holder, wrappable)) {
             if (ScriptWrappable::wrapperCanBeStoredInObject(object))
                 return ScriptWrappable::setReturnValueWithSecurityCheck<V8T>(returnValue, object);
-            return DOMWrapperWorld::mainWorld()->domDataStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
+            return DOMWrapperWorld::mainWorld().domDataStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
         }
         return current(returnValue.GetIsolate()).template setReturnValueFrom<V8T>(returnValue, object);
     }
@@ -92,7 +92,7 @@ public:
     {
         if (ScriptWrappable::wrapperCanBeStoredInObject(object))
             return ScriptWrappable::setReturnValue(returnValue, object);
-        return DOMWrapperWorld::mainWorld()->domDataStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
+        return DOMWrapperWorld::mainWorld().domDataStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
     }
 
     template<typename V8T, typename T>