Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/platform/JSONValues.cpp

 /*
  * Copyright (C) 2010 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 117 matching lines @@
     return false;
 }
 
 bool JSONValue::asArray(RefPtr<JSONArray>*)
 {
     return false;
 }
 
 PassRefPtr<JSONObject> JSONValue::asObject()
 {
-    return 0;
+    return nullptr;
 }
 
 PassRefPtr<JSONArray> JSONValue::asArray()
 {
-    return 0;
+    return nullptr;
 }
 
 String JSONValue::toJSONString() const
 {
     StringBuilder result;
     result.reserveCapacity(512);
     writeJSON(&result);
     return result.toString();
 }
 
@@ skipping 129 matching lines @@
     RefPtr<JSONValue> value = get(name);
     if (!value)
         return false;
     return value->asString(output);
 }
 
 PassRefPtr<JSONObject> JSONObjectBase::getObject(const String& name) const
 {
     RefPtr<JSONValue> value = get(name);
     if (!value)
-        return 0;
+        return nullptr;
     return value->asObject();
 }
 
 PassRefPtr<JSONArray> JSONObjectBase::getArray(const String& name) const
 {
     RefPtr<JSONValue> value = get(name);
     if (!value)
-        return 0;
+        return nullptr;
     return value->asArray();
 }
 
 PassRefPtr<JSONValue> JSONObjectBase::get(const String& name) const
 {
     Dictionary::const_iterator it = m_data.find(name);
     if (it == m_data.end())
-        return 0;
+        return nullptr;
     return it->value;
 }
 
 void JSONObjectBase::remove(const String& name)
 {
     m_data.remove(name);
     for (size_t i = 0; i < m_order.size(); ++i) {
         if (m_order[i] == name) {
             m_order.remove(i);
             break;
@@ skipping 57 matching lines @@
 {
 }
 
 PassRefPtr<JSONValue> JSONArrayBase::get(size_t index)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(index < m_data.size());
     return m_data[index];
 }
 
 } // namespace WebCore