Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/modules/mediasource/SourceBuffer.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 145 matching lines @@
     m_mode = newMode;
 }
 
 PassRefPtr<TimeRanges> SourceBuffer::buffered(ExceptionState& exceptionState) const
 {
     // Section 3.1 buffered attribute steps.
     // 1. If this object has been removed from the sourceBuffers attribute of the parent media source then throw an
     //    InvalidStateError exception and abort these steps.
     if (isRemoved()) {
         exceptionState.throwDOMException(InvalidStateError, "This SourceBuffer has been removed from the parent media source.");
-        return 0;
+        return nullptr;
     }
 
     // 2. Return a new static normalized TimeRanges object for the media segments buffered.
     return TimeRanges::create(m_webSourceBuffer->buffered());
 }
 
 double SourceBuffer::timestampOffset() const
 {
     return m_timestampOffset;
 }
@@ skipping 246 matching lines @@
 
 void SourceBuffer::removedFromMediaSource()
 {
     if (isRemoved())
         return;
 
     abortIfUpdating();
 
     m_webSourceBuffer->removedFromMediaSource();
     m_webSourceBuffer.clear();
-    m_source = 0;
+    m_source = nullptr;
     m_asyncEventQueue = 0;
 }
 
 bool SourceBuffer::hasPendingActivity() const
 {
     return m_source;
 }
 
 void SourceBuffer::suspend()
 {
@@ skipping 226 matching lines @@
     // 14. Queue a task to fire a simple event named updateend at this SourceBuffer object.
     scheduleEvent(EventTypeNames::updateend);
     TRACE_EVENT_ASYNC_END0("media", "SourceBuffer::appendStream", this);
 }
 
 void SourceBuffer::clearAppendStreamState()
 {
     m_streamMaxSizeValid = false;
     m_streamMaxSize = 0;
     m_loader.clear();
-    m_stream = 0;
+    m_stream = nullptr;
 }
 
 void SourceBuffer::didStartLoading()
 {
     WTF_LOG(Media, "SourceBuffer::didStartLoading() %p", this);
 }
 
 void SourceBuffer::didReceiveDataForClient(const char* data, unsigned dataLength)
 {
     WTF_LOG(Media, "SourceBuffer::didReceiveDataForClient(%d) %p", dataLength, this);
@@ skipping 14 matching lines @@
     WTF_LOG(Media, "SourceBuffer::didFail(%d) %p", errorCode, this);
     appendStreamDone(false);
 }
 
 void SourceBuffer::trace(Visitor* visitor)
 {
     visitor->trace(m_source);
 }
 
 } // namespace WebCore