Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/inspector/InspectorInstrumentation.cpp

 /*
 * 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:
 *
 *     * 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 38 matching lines @@
 
 namespace {
 static HashSet<InstrumentingAgents*>* instrumentingAgentsSet = 0;
 }
 
 namespace InspectorInstrumentation {
 int FrontendCounter::s_frontendCounter = 0;
 }
 
 InspectorInstrumentationCookie::InspectorInstrumentationCookie()
-    : m_instrumentingAgents(0)
+    : m_instrumentingAgents(nullptr)
     , m_timelineAgentId(0)
 {
 }
 
 InspectorInstrumentationCookie::InspectorInstrumentationCookie(InstrumentingAgents* agents, int timelineAgentId)
     : m_instrumentingAgents(agents)
     , m_timelineAgentId(timelineAgentId)
 {
 }
 
@@ skipping 186 matching lines @@
 
 InstrumentingAgents* instrumentationForWorkerGlobalScope(WorkerGlobalScope* workerGlobalScope)
 {
     if (WorkerInspectorController* controller = workerGlobalScope->workerInspectorController())
         return controller->m_instrumentingAgents.get();
     return 0;
 }
 
 } // namespace WebCore