Have Document::elementSheet() return a reference

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 2885 matching lines @@
 
 void Document::executeScriptsWaitingForResourcesIfNeeded()
 {
     if (!haveStylesheetsAndImportsLoaded())
         return;
     if (ScriptableDocumentParser* parser = scriptableDocumentParser())
         parser->executeScriptsWaitingForResources();
 }
 
 
-CSSStyleSheet* Document::elementSheet()
+CSSStyleSheet& Document::elementSheet()
 {
     if (!m_elemSheet)
         m_elemSheet = CSSStyleSheet::createInline(this, m_baseURL);
-    return m_elemSheet.get();
+    return *m_elemSheet;
 }
 
 void Document::processHttpEquiv(const AtomicString& equiv, const AtomicString& content, bool inDocumentHeadElement)
 {
     ASSERT(!equiv.isNull() && !content.isNull());
 
     if (equalIgnoringCase(equiv, "default-style")) {
         processHttpEquivDefaultStyle(content);
     } else if (equalIgnoringCase(equiv, "refresh")) {
         processHttpEquivRefresh(content);
@@ skipping 2517 matching lines @@
 void Document::defaultEventHandler(Event* event)
 {
     if (frame() && frame()->remotePlatformLayer()) {
         frame()->chromeClient().forwardInputEvent(this, event);
         return;
     }
     Node::defaultEventHandler(event);
 }
 
 } // namespace WebCore