NULL -> nullptr under athena/

athena/extensions/chrome/app_list_controller_delegate_athena.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/extensions/chrome/app_list_controller_delegate_athena.h"
 
 #include "athena/activity/public/activity_factory.h"
 #include "athena/extensions/public/extensions_delegate.h"
 #include "chrome/browser/profiles/profile.h"
 #include "extensions/common/extension.h"
 #include "ui/app_list/views/app_list_view.h"
 
 namespace athena {
 
 AppListControllerDelegateAthena::AppListControllerDelegateAthena() {
 }
 
 AppListControllerDelegateAthena::~AppListControllerDelegateAthena() {
 }
 
 void AppListControllerDelegateAthena::DismissView() {
 }
 
 gfx::NativeWindow AppListControllerDelegateAthena::GetAppListWindow() {
   NOTIMPLEMENTED();
-  return NULL;
+  return nullptr;
 }
 
 gfx::Rect AppListControllerDelegateAthena::GetAppListBounds() {
   NOTIMPLEMENTED();
   return gfx::Rect();
 }
 
 gfx::ImageSkia AppListControllerDelegateAthena::GetWindowIcon() {
   return gfx::ImageSkia();
 }
@@ skipping 68 matching lines @@
     const base::FilePath& profile_path) {
   // Ash doesn't have profile switching.
   NOTREACHED();
 }
 
 bool AppListControllerDelegateAthena::ShouldShowUserIcon() {
   return false;
 }
 
 }  // namespace athena