Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/speech/SpeechSynthesis.cpp

 /*
  * Copyright (C) 2013 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 26 matching lines @@
 DEFINE_GC_INFO(SpeechSynthesis);
 
 PassRefPtrWillBeRawPtr<SpeechSynthesis> SpeechSynthesis::create(ExecutionContext* context)
 {
     return adoptRefCountedWillBeRefCountedGarbageCollected(new SpeechSynthesis(context));
 }
 
 SpeechSynthesis::SpeechSynthesis(ExecutionContext* context)
     : ContextLifecycleObserver(context)
     , m_platformSpeechSynthesizer(PlatformSpeechSynthesizer::create(this))
-    , m_currentSpeechUtterance(0)
+    , m_currentSpeechUtterance(nullptr)
     , m_isPaused(false)
 {
     ScriptWrappable::init(this);
 }
 
 void SpeechSynthesis::setPlatformSynthesizer(PassOwnPtr<PlatformSpeechSynthesizer> synthesizer)
 {
     m_platformSpeechSynthesizer = synthesizer;
 }
 
@@ skipping 65 matching lines @@
         startSpeakingImmediately(utterance);
 }
 
 void SpeechSynthesis::cancel()
 {
     // Remove all the items from the utterance queue.
     // Hold on to the current utterance so the platform synthesizer can have a chance to clean up.
     RefPtrWillBeMember<SpeechSynthesisUtterance> current = m_currentSpeechUtterance;
     m_utteranceQueue.clear();
     m_platformSpeechSynthesizer->cancel();
-    current = 0;
+    current = nullptr;
 
     // The platform should have called back immediately and cleared the current utterance.
     ASSERT(!m_currentSpeechUtterance);
 }
 
 void SpeechSynthesis::pause()
 {
     if (!m_isPaused)
         m_platformSpeechSynthesizer->pause();
 }
 
 void SpeechSynthesis::resume()
 {
     if (!m_currentSpeechUtterance)
         return;
     m_platformSpeechSynthesizer->resume();
 }
 
 void SpeechSynthesis::fireEvent(const AtomicString& type, SpeechSynthesisUtterance* utterance, unsigned long charIndex, const String& name)
 {
     if (!executionContext()->activeDOMObjectsAreStopped())
         utterance->dispatchEvent(SpeechSynthesisEvent::create(type, charIndex, (currentTime() - utterance->startTime()), name));
 }
 
 void SpeechSynthesis::handleSpeakingCompleted(SpeechSynthesisUtterance* utterance, bool errorOccurred)
 {
     ASSERT(utterance);
     ASSERT(m_currentSpeechUtterance);
-    m_currentSpeechUtterance = 0;
+    m_currentSpeechUtterance = nullptr;
 
     fireEvent(errorOccurred ? EventTypeNames::error : EventTypeNames::end, utterance, 0, String());
 
     if (m_utteranceQueue.size()) {
         RefPtrWillBeMember<SpeechSynthesisUtterance> firstUtterance = m_utteranceQueue.first();
         ASSERT(firstUtterance == utterance);
         if (firstUtterance == utterance)
             m_utteranceQueue.removeFirst();
 
         // Start the next job if there is one pending.
@@ skipping 57 matching lines @@
 }
 
 void SpeechSynthesis::trace(Visitor* visitor)
 {
     visitor->trace(m_voiceList);
     visitor->trace(m_currentSpeechUtterance);
     visitor->trace(m_utteranceQueue);
 }
 
 } // namespace WebCore