Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/bindings/v8/ScriptController.cpp

 /*
  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 300 matching lines @@
     v8::Local<v8::Context> v8Context = m_windowShell->context();
     v8Context->AllowCodeGenerationFromStrings(false);
     v8Context->SetErrorMessageForCodeGenerationFromStrings(v8String(m_isolate, errorMessage));
 }
 
 PassRefPtr<SharedPersistent<v8::Object> > ScriptController::createPluginWrapper(Widget* widget)
 {
     ASSERT(widget);
 
     if (!widget->isPluginView())
-        return 0;
+        return nullptr;
 
     NPObject* npObject = toPluginView(widget)->scriptableObject();
     if (!npObject)
-        return 0;
+        return nullptr;
 
     // Frame Memory Management for NPObjects
     // -------------------------------------
     // NPObjects are treated differently than other objects wrapped by JS.
     // NPObjects can be created either by the browser (e.g. the main
     // window object) or by the plugin (the main plugin object
     // for a HTMLEmbedElement). Further, unlike most DOM Objects, the frame
     // is especially careful to ensure NPObjects terminate at frame teardown because
     // if a plugin leaks a reference, it could leak its objects (or the browser's objects).
     //
@@ skipping 315 matching lines @@
         v8Results = evaluateHandleScope.Escape(resultArray);
     }
 
     if (results && !v8Results.IsEmpty()) {
         for (size_t i = 0; i < v8Results->Length(); ++i)
             results->append(ScriptValue(v8Results->Get(i), m_isolate));
     }
 }
 
 } // namespace WebCore