Have DOMWindow deal with references instead of pointers when possible

Source/web/WebFrameImpl.cpp

 /*
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 756 matching lines @@
 {
     if (!frame() || !frame()->document())
         return WebDocument();
     return WebDocument(frame()->document());
 }
 
 WebPerformance WebFrameImpl::performance() const
 {
     if (!frame())
         return WebPerformance();
-    return WebPerformance(frame()->domWindow()->performance());
+    return WebPerformance(&frame()->domWindow()->performance());
 }
 
 NPObject* WebFrameImpl::windowObject() const
 {
     if (!frame())
         return 0;
     return frame()->script().windowScriptNPObject();
 }
 
 void WebFrameImpl::bindToWindowObject(const WebString& name, NPObject* object)
@@ skipping 1697 matching lines @@
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace blink