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

Source/core/html/shadow/MediaControlsChromium.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 133 matching lines @@
     MediaControls::setMediaController(controller);
 
     if (m_durationDisplay)
         m_durationDisplay->setMediaController(controller);
     if (m_enclosure)
         m_enclosure->setMediaController(controller);
 }
 
 void MediaControlsChromium::reset()
 {
-    Page* page = document()->page();
+    Page* page = document().page();
     if (!page)
         return;
 
     double duration = m_mediaController->duration();
     m_durationDisplay->setInnerText(RenderTheme::theme().formatMediaControlsTime(duration), ASSERT_NO_EXCEPTION);
     m_durationDisplay->setCurrentValue(duration);
 
     MediaControls::reset();
 }
 
 void MediaControlsChromium::playbackStarted()
 {
     m_currentTimeDisplay->show();
     m_durationDisplay->hide();
 
     MediaControls::playbackStarted();
 }
 
 void MediaControlsChromium::updateCurrentTimeDisplay()
 {
     double now = m_mediaController->currentTime();
     double duration = m_mediaController->duration();
 
-    Page* page = document()->page();
+    Page* page = document().page();
     if (!page)
         return;
 
     // After seek, hide duration display and show current time.
     if (now > 0) {
         m_currentTimeDisplay->show();
         m_durationDisplay->hide();
     }
 
     // Allow the theme to format the time.
     m_currentTimeDisplay->setInnerText(RenderTheme::theme().formatMediaControlsCurrentTime(now, duration), IGNORE_EXCEPTION);
     m_currentTimeDisplay->setCurrentValue(now);
 }
 
 void MediaControlsChromium::changedMute()
 {
     MediaControls::changedMute();
 
     if (m_mediaController->muted())
         m_volumeSlider->setVolume(0);
     else
         m_volumeSlider->setVolume(m_mediaController->volume());
 }
 
 void MediaControlsChromium::createTextTrackDisplay()
 {
     if (m_textDisplayContainer)
         return;
 
-    RefPtr<MediaControlTextTrackContainerElement> textDisplayContainer = MediaControlTextTrackContainerElement::create(document());
+    RefPtr<MediaControlTextTrackContainerElement> textDisplayContainer = MediaControlTextTrackContainerElement::create(&document());
     m_textDisplayContainer = textDisplayContainer.get();
 
     if (m_mediaController)
         m_textDisplayContainer->setMediaController(m_mediaController);
 
     insertTextTrackContainer(textDisplayContainer.release());
 }
 
 void MediaControlsChromium::insertTextTrackContainer(PassRefPtr<MediaControlTextTrackContainerElement> textTrackContainer)
 {
     // Insert it before the first controller element so it always displays behind the controls.
     // In the Chromium case, that's the enclosure element.
     insertBefore(textTrackContainer, m_enclosure);
 }
 
 
 }