Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/bindings/v8/ScriptCallStackFactory.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 86 matching lines @@
 
 PassRefPtr<ScriptCallStack> createScriptCallStack(v8::Handle<v8::StackTrace> stackTrace, size_t maxStackSize, v8::Isolate* isolate)
 {
     return createScriptCallStack(stackTrace, maxStackSize, true, isolate);
 }
 
 PassRefPtr<ScriptCallStack> createScriptCallStack(size_t maxStackSize, bool emptyStackIsAllowed)
 {
     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     if (!isolate->InContext())
-        return 0;
+        return nullptr;
     v8::HandleScope handleScope(isolate);
     v8::Handle<v8::StackTrace> stackTrace(v8::StackTrace::CurrentStackTrace(isolate, maxStackSize, stackTraceOptions));
     return createScriptCallStack(stackTrace, maxStackSize, emptyStackIsAllowed, isolate);
 }
 
 PassRefPtr<ScriptCallStack> createScriptCallStackForConsole(size_t maxStackSize)
 {
     size_t stackSize = 1;
     if (InspectorInstrumentation::hasFrontends()) {
         ExecutionContext* executionContext = currentExecutionContext(v8::Isolate::GetCurrent());
@@ skipping 11 matching lines @@
     ScriptState* state = ScriptState::forContext(context);
 
     Vector<ScriptValue> arguments;
     for (int i = skipArgumentCount; i < v8arguments.Length(); ++i)
         arguments.append(ScriptValue(v8arguments[i], isolate));
 
     return ScriptArguments::create(state, arguments);
 }
 
 } // namespace WebCore