Have Document::mediaQueryMatcher() / Document::selectorQueryCache() return references

Source/core/frame/DOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 407 matching lines @@
     return m_document.get();
 }
 
 DOMWindow* DOMWindow::toDOMWindow()
 {
     return this;
 }
 
 PassRefPtr<MediaQueryList> DOMWindow::matchMedia(const String& media)
 {
-    return document() ? document()->mediaQueryMatcher()->matchMedia(media) : 0;
+    return document() ? document()->mediaQueryMatcher().matchMedia(media) : 0;
 }
 
 Page* DOMWindow::page()
 {
     return frame() ? frame()->page() : 0;
 }
 
 void DOMWindow::frameDestroyed()
 {
     FrameDestructionObserver::frameDestroyed();
@@ skipping 1328 matching lines @@
     return static_cast<DOMWindowLifecycleNotifier*>(LifecycleContext::lifecycleNotifier());
 }
 
 PassOwnPtr<LifecycleNotifier> DOMWindow::createLifecycleNotifier()
 {
     return DOMWindowLifecycleNotifier::create(this);
 }
 
 
 } // namespace WebCore