Have Frame::loader() return a reference

Source/core/html/HTMLHtmlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 49 matching lines @@
 
 void HTMLHtmlElement::insertedByParser()
 {
     // When parsing a fragment, its dummy document has a null parser.
     if (!document().parser() || !document().parser()->documentWasLoadedAsPartOfNavigation())
         return;
 
     if (!document().frame())
         return;
 
-    DocumentLoader* documentLoader = document().frame()->loader()->documentLoader();
+    DocumentLoader* documentLoader = document().frame()->loader().documentLoader();
     if (!documentLoader)
         return;
 
     const AtomicString& manifest = getAttribute(manifestAttr);
     if (manifest.isEmpty())
         documentLoader->applicationCacheHost()->selectCacheWithoutManifest();
     else
         documentLoader->applicationCacheHost()->selectCacheWithManifest(document().completeURL(manifest));
 }
 
 }