DOMImplementation::document(): remove redundant get().

Source/core/dom/DOMImplementation.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 34 matching lines @@
 public:
     static PassOwnPtrWillBeRawPtr<DOMImplementation> create(Document& document)
     {
         return adoptPtrWillBeNoop(new DOMImplementation(document));
     }
 
 #if !ENABLE(OILPAN)
     void ref() { m_document->ref(); }
     void deref() { m_document->deref(); }
 #endif
-    Document& document() const { return *m_document.get(); }
+    Document& document() const { return *m_document; }
 
     // DOM methods & attributes for DOMImplementation
     static bool hasFeature(const String& feature, const String& version);
     bool hasFeatureForBindings(const String& feature, const String& version);
     PassRefPtr<DocumentType> createDocumentType(const AtomicString& qualifiedName, const String& publicId, const String& systemId, ExceptionState&);
     PassRefPtr<XMLDocument> createDocument(const AtomicString& namespaceURI, const AtomicString& qualifiedName, DocumentType*, ExceptionState&);
 
     // From the HTMLDOMImplementation interface
     PassRefPtr<HTMLDocument> createHTMLDocument(const String& title);
 
     // Other methods (not part of DOM)
     static PassRefPtr<Document> createDocument(const String& mimeType, LocalFrame*, const KURL&, bool inViewSourceMode);
     static PassRefPtr<Document> createDocument(const String& mimeType, const DocumentInit&, bool inViewSourceMode);
 
     static bool isXMLMIMEType(const String&);
     static bool isTextMIMEType(const String&);
     static bool isJSONMIMEType(const String&);
 
     void trace(Visitor*);
 
 private:
     explicit DOMImplementation(Document&);
 
     RawPtrWillBeMember<Document> m_document;
 };
 
 } // namespace WebCore
 
 #endif