NULL -> nullptr under athena/

athena/main/athena_main.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "athena/activity/public/activity_factory.h"
 #include "athena/activity/public/activity_manager.h"
 #include "athena/content/public/web_contents_view_delegate_creator.h"
 #include "athena/env/public/athena_env.h"
 #include "athena/extensions/public/extensions_delegate.h"
 #include "athena/main/athena_content_client.h"
@@ skipping 43 matching lines @@
     return athena::AthenaEnv::Get()->GetHost();
   }
 
   // Creates a new app window and adds it to the desktop. The desktop maintains
   // ownership of the window.
   // TODO(jamescook|oshima): Is this function needed?
   virtual extensions::AppWindow* CreateAppWindow(
       content::BrowserContext* context,
       const extensions::Extension* extension) override {
     NOTIMPLEMENTED();
-    return NULL;
+    return nullptr;
   }
 
   // Adds the window to the desktop.
   virtual void AddAppWindow(aura::Window* window) override {
     NOTIMPLEMENTED();
   }
 
   // Closes and destroys the app windows.
   virtual void CloseAppWindows() override {}
 
@@ skipping 115 matching lines @@
 
 int main(int argc, const char** argv) {
   AthenaMainDelegate delegate;
   content::ContentMainParams params(&delegate);
 
   params.argc = argc;
   params.argv = argv;
 
   return content::ContentMain(params);
 }