Have Node::document() return a reference instead of a pointer

Source/core/rendering/RenderMarquee.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 54 matching lines @@
     , m_totalLoops(0)
     , m_timer(this, &RenderMarquee::timerFired)
     , m_start(0)
     , m_end(0)
     , m_speed(0)
     , m_reset(false)
     , m_suspended(false)
     , m_stopped(false)
     , m_direction(MAUTO)
 {
-    UseCounter::count(document(), UseCounter::HTMLMarqueeElement);
+    UseCounter::count(&document(), UseCounter::HTMLMarqueeElement);
 }
 
 RenderMarquee::~RenderMarquee()
 {
 }
 
 int RenderMarquee::marqueeSpeed() const
 {
     int result = style()->marqueeSpeed();
     if (Node* node = this->node()) {
@@ skipping 74 matching lines @@
     }
 }
 
 void RenderMarquee::start()
 {
     if (m_timer.isActive() || style()->marqueeIncrement().isZero())
         return;
 
     // We may end up propagating a scroll event. It is important that we suspend events until
     // the end of the function since they could delete the layer, including the marquee.
-    FrameView* frameView = document()->view();
+    FrameView* frameView = document().view();
     if (frameView)
         frameView->pauseScheduledEvents();
 
     if (!m_suspended && !m_stopped) {
         if (isHorizontal())
             layer()->scrollToOffset(IntSize(m_start, 0));
         else
             layer()->scrollToOffset(IntSize(0, m_start));
     }
     else {
@@ skipping 150 matching lines @@
             m_reset = true;
     }
 
     if (isHorizontal())
         layer()->scrollToXOffset(newPos);
     else
         layer()->scrollToYOffset(newPos);
 }
 
 } // namespace WebCore