NULL -> nullptr under athena/

athena/system/system_ui_impl.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/system/public/system_ui.h"
 
 #include "athena/screen/public/screen_manager.h"
 #include "athena/system/background_controller.h"
 #include "athena/system/orientation_controller.h"
 #include "athena/system/shutdown_dialog.h"
 #include "athena/system/status_icon_container_view.h"
 #include "athena/system/time_view.h"
 #include "athena/util/container_priorities.h"
 #include "athena/util/fill_layout_manager.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/window.h"
 #include "ui/views/view.h"
 
 namespace athena {
 namespace {
 
-SystemUI* instance = NULL;
+SystemUI* instance = nullptr;
 
 // View which positions the TimeView on the left and the StatusIconView on the
 // right.
 class SystemInfoView : public views::View {
  public:
   SystemInfoView(SystemUI::ColorScheme color_scheme)
       : time_view_(new TimeView(color_scheme)),
         status_icon_view_(new StatusIconContainerView(color_scheme)) {
     AddChildView(time_view_);
     AddChildView(status_icon_view_);
@@ skipping 32 matching lines @@
   views::View* time_view_;
   views::View* status_icon_view_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemInfoView);
 };
 
 class SystemUIImpl : public SystemUI {
  public:
   SystemUIImpl(scoped_refptr<base::TaskRunner> blocking_task_runner)
       : orientation_controller_(new OrientationController()),
-        background_container_(NULL) {
+        background_container_(nullptr) {
     orientation_controller_->InitWith(blocking_task_runner);
   }
 
   virtual ~SystemUIImpl() {
     // Stops file watching now if exists. Waiting until message loop shutdon
     // leads to FilePathWatcher crash.
     orientation_controller_->Shutdown();
   }
 
   void Init() {
@@ skipping 49 matching lines @@
 // static
 SystemUI* SystemUI::Get() {
   DCHECK(instance);
   return instance;
 }
 
 // static
 void SystemUI::Shutdown() {
   CHECK(instance);
   delete instance;
-  instance = NULL;
+  instance = nullptr;
 }
 
 }  // namespace athena