Use C++11 features in core/html

Source/core/html/HTMLAppletElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 86 matching lines @@
 
     if (usePlaceholderContent())
         return new RenderBlockFlow(this);
 
     return new RenderApplet(this);
 }
 
 RenderPart* HTMLAppletElement::renderPartForJSBindings() const
 {
     if (!canEmbedJava())
-        return 0;
+        return nullptr;
     return HTMLPlugInElement::renderPartForJSBindings();
 }
 
 RenderPart* HTMLAppletElement::existingRenderPart() const
 {
     return renderPart();
 }
 
 void HTMLAppletElement::updateWidgetInternal()
 {
@@ skipping 110 matching lines @@
 
     if (!document().contentSecurityPolicy()->allowObjectFromSource(url)
         || !document().contentSecurityPolicy()->allowPluginType(m_serviceType, m_serviceType, url)) {
         renderEmbeddedObject()->setPluginUnavailabilityReason(RenderEmbeddedObject::PluginBlockedByContentSecurityPolicy);
         return false;
     }
     return true;
 }
 
 }