Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/inspector/CodeGeneratorInspectorStrings.py

 # 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
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 73 matching lines @@
 """)
 
 callback_failure_method = (
 """void InspectorBackendDispatcher::$agentName::$callbackName::sendFailure(const ErrorString& error, $parameter)
 {
     ASSERT(error.length());
     RefPtr<JSONValue> errorDataValue;
     if (error) {
         errorDataValue = $argument;
     }
-    sendIfActive(0, error, errorDataValue.release());
+    sendIfActive(nullptr, error, errorDataValue.release());
 }
 """)
 
 
 frontend_h = (
 """#ifndef InspectorFrontend_h
 #define InspectorFrontend_h
 
 #include "InspectorTypeBuilder.h"
 #include "platform/JSONValues.h"
@@ skipping 384 matching lines @@
 }
 
 InspectorBackendDispatcher::CallbackBase::CallbackBase(PassRefPtr<InspectorBackendDispatcherImpl> backendImpl, int id)
     : m_backendImpl(backendImpl), m_id(id), m_alreadySent(false) {}
 
 InspectorBackendDispatcher::CallbackBase::~CallbackBase() {}
 
 void InspectorBackendDispatcher::CallbackBase::sendFailure(const ErrorString& error)
 {
     ASSERT(error.length());
-    sendIfActive(0, error, PassRefPtr<JSONValue>());
+    sendIfActive(nullptr, error, PassRefPtr<JSONValue>());
 }
 
 bool InspectorBackendDispatcher::CallbackBase::isActive()
 {
     return !m_alreadySent && m_backendImpl->isActive();
 }
 
 void InspectorBackendDispatcher::CallbackBase::sendIfActive(PassRefPtr<JSONObject> partialMessage, const ErrorString& invocationError, PassRefPtr<JSONValue> errorData)
 {
     if (m_alreadySent)
@@ skipping 428 matching lines @@
     };
 
 """)
 
 class_binding_builder_part_4 = (
 """    static Builder<NoFieldsSet> create()
     {
         return Builder<NoFieldsSet>(JSONObject::create());
     }
 """)