Chrome::client() should return a ChromeClient reference.

Source/core/page/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 561 matching lines @@
         if (document->renderer() && document->renderer()->needsLayout() && view->didFirstLayout())
             view->layout();
     }
 }
 
 void Frame::deviceOrPageScaleFactorChanged()
 {
     for (RefPtr<Frame> child = tree()->firstChild(); child; child = child->tree()->nextSibling())
         child->deviceOrPageScaleFactorChanged();
 
-    m_page->chrome().client()->deviceOrPageScaleFactorChanged();
+    m_page->chrome().client().deviceOrPageScaleFactorChanged();
 }
 
 void Frame::notifyChromeClientWheelEventHandlerCountChanged() const
 {
     // Ensure that this method is being called on the main frame of the page.
     ASSERT(m_page && m_page->mainFrame() == this);
 
     unsigned count = 0;
     for (const Frame* frame = this; frame; frame = frame->tree()->traverseNext()) {
         if (frame->document())
             count += frame->document()->wheelEventHandlerCount();
     }
 
-    m_page->chrome().client()->numWheelEventHandlersChanged(count);
+    m_page->chrome().client().numWheelEventHandlersChanged(count);
 }
 
 bool Frame::isURLAllowed(const KURL& url) const
 {
     // We allow one level of self-reference because some sites depend on that,
     // but we don't allow more than one.
     if (m_page->subframeCount() >= Page::maxNumberOfFrames)
         return false;
     bool foundSelfReference = false;
     for (const Frame* frame = this; frame; frame = frame->tree()->parent()) {
@@ skipping 107 matching lines @@
     if (!m_page)
         return 0;
 
     double ratio = m_page->deviceScaleFactor();
     if (RuntimeEnabledFeatures::devicePixelRatioIncludesZoomEnabled())
         ratio *= pageZoomFactor();
     return ratio;
 }
 
 } // namespace WebCore