Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

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 41 matching lines @@
     , m_enclosure(0)
     , m_hideFullscreenControlsTimer(this, &MediaControls::hideFullscreenControlsTimerFired)
     , m_isFullscreen(false)
     , m_isMouseOverControls(false)
 {
 }
 
 PassRefPtr<MediaControls> MediaControls::create(Document& document)
 {
     if (!document.page())
-        return 0;
+        return nullptr;
 
     RefPtr<MediaControls> controls;
 #if OS(ANDROID)
     controls = adoptRef(new MediaControlsAndroid(document));
 #else
     controls = adoptRef(new MediaControls(document));
 #endif
 
     if (controls->initializeControls(document))
         return controls.release();
 
-    return 0;
+    return nullptr;
 }
 
 bool MediaControls::initializeControls(Document& document)
 {
     // Create an enclosing element for the panel so we can visually offset the controls correctly.
     RefPtr<MediaControlPanelEnclosureElement> enclosure = MediaControlPanelEnclosureElement::create(document);
 
     RefPtr<MediaControlPanelElement> panel = MediaControlPanelElement::create(document);
 
     TrackExceptionState exceptionState;
@@ skipping 400 matching lines @@
     m_textDisplayContainer->updateDisplay();
 }
 
 void MediaControls::insertTextTrackContainer(PassRefPtr<MediaControlTextTrackContainerElement> textTrackContainer)
 {
     // Insert it before the first controller element so it always displays behind the controls.
     insertBefore(textTrackContainer, m_enclosure);
 }
 
 }