Have Document::markers() return a reference

Source/core/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All Rights Reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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.
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 308 matching lines @@
         : curr->tree().traversePreviousWithWrap(wrapFlag);
 }
 
 void Page::unmarkAllTextMatches()
 {
     if (!mainFrame())
         return;
 
     LocalFrame* frame = mainFrame();
     do {
-        frame->document()->markers()->removeMarkers(DocumentMarker::TextMatch);
+        frame->document()->markers().removeMarkers(DocumentMarker::TextMatch);
         frame = incrementFrame(frame, true, false);
     } while (frame);
 }
 
 void Page::setDefersLoading(bool defers)
 {
     if (defers == m_defersLoading)
         return;
 
     m_defersLoading = defers;
@@ skipping 217 matching lines @@
     , spellCheckerClient(0)
     , storageClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace WebCore