Bug 1470306 - MessagePort unlinked should start the cleanup/close/shutdown procedure of the object, r=smaug

dom/messagechannel/MessagePort.cpp

@@ -176,9 +176,9 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(MessagePort,
     NS_IMPL_CYCLE_COLLECTION_UNLINK(mPostMessageRunnable->mPort);
   }
 
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessages);
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessagesForTheOtherPort);
-  NS_IMPL_CYCLE_COLLECTION_UNLINK(mUnshippedEntangledPort);
+
+  tmp->CloseForced();
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
 
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MessagePort,