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

Source/core/html/shadow/MediaControls.cpp

 /*
  * Copyright (C) 2011, 2012 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 61 matching lines @@
     if (m_volumeSlider)
         m_volumeSlider->setMediaController(controller);
     if (m_toggleClosedCaptionsButton)
         m_toggleClosedCaptionsButton->setMediaController(controller);
     if (m_fullScreenButton)
         m_fullScreenButton->setMediaController(controller);
 }
 
 void MediaControls::reset()
 {
-    Page* page = document()->page();
+    Page* page = document().page();
     if (!page)
         return;
 
     m_playButton->updateDisplayType();
 
     updateCurrentTimeDisplay();
 
     double duration = m_mediaController->duration();
     if (std::isfinite(duration) || RenderTheme::theme().hasOwnDisabledStateHandlingFor(MediaSliderPart)) {
         m_timeline->setDuration(duration);
@@ skipping 21 matching lines @@
             m_fullScreenButton->show();
         else
             m_fullScreenButton->hide();
     }
 
     makeOpaque();
 }
 
 void MediaControls::reportedError()
 {
-    Page* page = document()->page();
+    Page* page = document().page();
     if (!page)
         return;
 
     if (!RenderTheme::theme().hasOwnDisabledStateHandlingFor(MediaMuteButtonPart)) {
         m_panelMuteButton->hide();
         m_volumeSlider->hide();
     }
 
     if (m_toggleClosedCaptionsButton && !RenderTheme::theme().hasOwnDisabledStateHandlingFor(MediaToggleClosedCaptionsButtonPart))
         m_toggleClosedCaptionsButton->hide();
@@ skipping 177 matching lines @@
         return;
 
     makeTransparent();
 }
 
 void MediaControls::startHideFullscreenControlsTimer()
 {
     if (!m_isFullscreen)
         return;
 
-    Page* page = document()->page();
+    Page* page = document().page();
     if (!page)
         return;
 
     m_hideFullscreenControlsTimer.startOneShot(timeWithoutMouseMovementBeforeHidingFullscreenControls);
 }
 
 void MediaControls::stopHideFullscreenControlsTimer()
 {
     m_hideFullscreenControlsTimer.stop();
 }
@@ skipping 12 matching lines @@
     if (!relatedTarget)
         return false;
     return contains(relatedTarget->toNode());
 }
 
 void MediaControls::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);
 
     // Insert it before the first controller element so it always displays behind the controls.
     insertBefore(textDisplayContainer.release(), m_panel, IGNORE_EXCEPTION);
 }
 
 void MediaControls::showTextTrackDisplay()
@@ skipping 12 matching lines @@
 
 void MediaControls::updateTextTrackDisplay()
 {
     if (!m_textDisplayContainer)
         createTextTrackDisplay();
 
     m_textDisplayContainer->updateDisplay();
 }
 
 }