Page::chrome() should return a 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 278 matching lines @@
         m_doc->attach();
 
     if (m_doc) {
         m_script->updateDocument();
         m_doc->updateViewportArguments();
     }
 
     if (m_page && m_page->mainFrame() == this) {
         notifyChromeClientWheelEventHandlerCountChanged();
         if (m_doc && m_doc->hasTouchEventHandlers())
-            m_page->chrome()->client()->needTouchEvents(true);
+            m_page->chrome().client()->needTouchEvents(true);
     }
 }
 
 #if ENABLE(ORIENTATION_EVENTS)
 void Frame::sendOrientationChangeEvent(int orientation)
 {
     m_orientation = orientation;
     if (Document* doc = document())
         doc->dispatchWindowEvent(Event::create(eventNames().orientationchangeEvent, false, false));
 }
@@ skipping 334 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 96 matching lines @@
     buffer->context()->translate(-paintingRect.x(), -paintingRect.y());
     buffer->context()->clip(FloatRect(0, 0, paintingRect.maxX(), paintingRect.maxY()));
 
     m_view->paintContents(buffer->context(), paintingRect);
 
     RefPtr<Image> image = buffer->copyImage();
     return createDragImageFromImage(image.get());
 }
 
 } // namespace WebCore