Have Frame::loader() return a reference

Source/modules/mediastream/RTCPeerConnection.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 136 matching lines @@
         es.throwUninformativeAndGenericDOMException(NotSupportedError);
         return;
     }
 
     m_peerHandler = RTCPeerConnectionHandler::create(this);
     if (!m_peerHandler) {
         es.throwUninformativeAndGenericDOMException(NotSupportedError);
         return;
     }
 
-    document->frame()->loader()->client()->dispatchWillStartUsingPeerConnectionHandler(m_peerHandler.get());
+    document->frame()->loader().client()->dispatchWillStartUsingPeerConnectionHandler(m_peerHandler.get());
 
     if (!m_peerHandler->initialize(configuration, constraints)) {
         es.throwUninformativeAndGenericDOMException(NotSupportedError);
         return;
     }
 }
 
 RTCPeerConnection::~RTCPeerConnection()
 {
     stop();
@@ skipping 519 matching lines @@
     events.swap(m_scheduledEvents);
 
     Vector<RefPtr<Event> >::iterator it = events.begin();
     for (; it != events.end(); ++it)
         dispatchEvent((*it).release());
 
     events.clear();
 }
 
 } // namespace WebCore