Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/inspector/InspectorInspectorAgent.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2011 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
@@ skipping 140 matching lines @@
 
 void InspectorInspectorAgent::setInjectedScriptForOrigin(const String& origin, const String& source)
 {
     m_injectedScriptForOrigin.set(origin, source);
 }
 
 void InspectorInspectorAgent::inspect(PassRefPtr<TypeBuilder::Runtime::RemoteObject> objectToInspect, PassRefPtr<JSONObject> hints)
 {
     if (m_state->getBoolean(InspectorAgentState::inspectorAgentEnabled) && m_frontend) {
         m_frontend->inspector()->inspect(objectToInspect, hints);
-        m_pendingInspectData.first = 0;
-        m_pendingInspectData.second = 0;
+        m_pendingInspectData.first = nullptr;
+        m_pendingInspectData.second = nullptr;
         return;
     }
     m_pendingInspectData.first = objectToInspect;
     m_pendingInspectData.second = hints;
 }
 
 } // namespace WebCore