Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/frame/ConsoleBase.cpp

 /*
  * Copyright (C) 2007 Apple 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
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 142 matching lines @@
     InspectorInstrumentation::addMessageToConsole(context(), ConsoleAPIMessageSource, StartGroupMessageType, LogMessageLevel, String(), state, arguments);
 }
 
 void ConsoleBase::groupCollapsed(ScriptState* state, PassRefPtr<ScriptArguments> arguments)
 {
     InspectorInstrumentation::addMessageToConsole(context(), ConsoleAPIMessageSource, StartGroupCollapsedMessageType, LogMessageLevel, String(), state, arguments);
 }
 
 void ConsoleBase::groupEnd()
 {
-    InspectorInstrumentation::addMessageToConsole(context(), ConsoleAPIMessageSource, EndGroupMessageType, LogMessageLevel, String(), 0);
+    InspectorInstrumentation::addMessageToConsole(context(), ConsoleAPIMessageSource, EndGroupMessageType, LogMessageLevel, String(), nullptr);
 }
 
 void ConsoleBase::internalAddMessage(MessageType type, MessageLevel level, ScriptState* state, PassRefPtr<ScriptArguments> scriptArguments, bool acceptNoArguments, bool printTrace)
 {
     if (!context())
         return;
 
     RefPtr<ScriptArguments> arguments = scriptArguments;
     if (!acceptNoArguments && !arguments->argumentCount())
         return;
 
     size_t stackSize = printTrace ? ScriptCallStack::maxCallStackSizeToCapture : 1;
     RefPtr<ScriptCallStack> callStack(createScriptCallStackForConsole(stackSize));
 
     String message;
     bool gotStringMessage = arguments->getFirstArgumentAsString(message);
     InspectorInstrumentation::addMessageToConsole(context(), ConsoleAPIMessageSource, type, level, message, state, arguments);
     if (gotStringMessage)
         reportMessageToClient(level, message, callStack);
 }
 
 } // namespace WebCore