Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 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 275 matching lines @@
 
     m_webFrame->willDetachParent();
 
     // Signal that no further communication with WebFrameClient should take
     // place at this point since we are no longer associated with the Page.
     m_webFrame->setClient(0);
 
     client->frameDetached(m_webFrame);
     // Clear our reference to WebCore::Frame at the very end, in case the client
     // refers to it.
-    m_webFrame->setWebCoreFrame(0);
+    m_webFrame->setWebCoreFrame(nullptr);
 }
 
 void FrameLoaderClientImpl::dispatchWillRequestAfterPreconnect(ResourceRequest& request)
 {
     if (m_webFrame->client()) {
         WrappedResourceRequest webreq(request);
         m_webFrame->client()->willRequestAfterPreconnect(m_webFrame, webreq);
     }
 }
 
@@ skipping 311 matching lines @@
 PassRefPtr<Widget> FrameLoaderClientImpl::createPlugin(
     const IntSize& size, // FIXME: how do we use this?
     HTMLPlugInElement* element,
     const KURL& url,
     const Vector<String>& paramNames,
     const Vector<String>& paramValues,
     const String& mimeType,
     bool loadManually)
 {
     if (!m_webFrame->client())
-        return 0;
+        return nullptr;
 
     WebPluginParams params;
     params.url = url;
     params.mimeType = mimeType;
     params.attributeNames = paramNames;
     params.attributeValues = paramValues;
     params.loadManually = loadManually;
 
     WebPlugin* webPlugin = m_webFrame->client()->createPlugin(m_webFrame, params);
     if (!webPlugin)
-        return 0;
+        return nullptr;
 
     // The container takes ownership of the WebPlugin.
     RefPtr<WebPluginContainerImpl> container =
         WebPluginContainerImpl::create(element, webPlugin);
 
     if (!webPlugin->initialize(container.get()))
-        return 0;
+        return nullptr;
 
     // The element might have been removed during plugin initialization!
     if (!element->renderer())
-        return 0;
+        return nullptr;
 
     return container;
 }
 
 PassRefPtr<Widget> FrameLoaderClientImpl::createJavaAppletWidget(
     const IntSize& size,
     HTMLAppletElement* element,
     const KURL& /* baseURL */,
     const Vector<String>& paramNames,
     const Vector<String>& paramValues)
@@ skipping 135 matching lines @@
     return adoptPtr(m_webFrame->client()->createApplicationCacheHost(m_webFrame, client));
 }
 
 void FrameLoaderClientImpl::didStopAllLoaders()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didAbortLoading(m_webFrame);
 }
 
 } // namespace blink