NULL -> nullptr under athena/

athena/virtual_keyboard/virtual_keyboard_manager_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/virtual_keyboard/public/virtual_keyboard_manager.h"
 
 #include "athena/screen/public/screen_manager.h"
 #include "athena/util/container_priorities.h"
 #include "athena/util/fill_layout_manager.h"
 #include "base/bind.h"
@@ skipping 44 matching lines @@
  private:
   content::BrowserContext* browser_context_;
   aura::Window* root_window_;
 
   DISALLOW_COPY_AND_ASSIGN(BasicKeyboardControllerProxy);
 };
 
 class VirtualKeyboardManagerImpl : public VirtualKeyboardManager {
  public:
   explicit VirtualKeyboardManagerImpl(content::BrowserContext* browser_context)
-      : browser_context_(browser_context),
-        container_(NULL) {
+      : browser_context_(browser_context), container_(nullptr) {
     CHECK(!instance);
     instance = this;
     Init();
   }
 
   virtual ~VirtualKeyboardManagerImpl() {
     CHECK_EQ(this, instance);
-    instance = NULL;
+    instance = nullptr;
 
-    keyboard::KeyboardController::ResetInstance(NULL);
+    keyboard::KeyboardController::ResetInstance(nullptr);
   }
 
  private:
   void Init() {
     athena::ScreenManager::ContainerParams params("VirtualKeyboardContainer",
                                                   CP_VIRTUAL_KEYBOARD);
     container_ = athena::ScreenManager::Get()->CreateContainer(params);
     container_->SetLayoutManager(new FillLayoutManager(container_));
 
     keyboard::KeyboardController* controller = new keyboard::KeyboardController(
@@ skipping 31 matching lines @@
   return instance;
 }
 
 void VirtualKeyboardManager::Shutdown() {
   CHECK(instance);
   delete instance;
   CHECK(!instance);
 }
 
 }  // namespace athena