NULL -> nullptr under athena/

athena/extensions/chrome/athena_extension_install_ui.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/athena_extension_install_ui.h"
 
 #include "base/i18n/rtl.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 40 matching lines @@
     const extensions::Extension* extension,
     const SkBitmap* icon) {
   if (skip_post_install_ui_)
     return;
 
   base::string16 extension_name = base::UTF8ToUTF16(extension->name());
   base::i18n::AdjustStringForLocaleDirection(&extension_name);
   base::string16 message = l10n_util::GetStringFUTF16(
       IDS_EXTENSION_INSTALLED_HEADING, extension_name);
   views::Widget* widget = views::DialogDelegate::CreateDialogWidget(
-      new MessageDialogDelegate(message), NULL, NULL);
+      new MessageDialogDelegate(message), nullptr, nullptr);
   widget->Show();
 }
 
 void AthenaExtensionInstallUI::OnInstallFailure(
     const extensions::CrxInstallerError& error) {
   if (skip_post_install_ui_)
     return;
 
   views::Widget* widget = views::DialogDelegate::CreateDialogWidget(
-      new MessageDialogDelegate(error.message()), NULL, NULL);
+      new MessageDialogDelegate(error.message()), nullptr, nullptr);
   widget->Show();
 }
 
 void AthenaExtensionInstallUI::SetUseAppInstalledBubble(bool use_bubble) {
 }
 
 void AthenaExtensionInstallUI::OpenAppInstalledUI(const std::string& app_id) {
   NOTREACHED();
 }
 
 void AthenaExtensionInstallUI::SetSkipPostInstallUI(bool skip_ui) {
   skip_post_install_ui_ = skip_ui;
 }
 
 gfx::NativeWindow AthenaExtensionInstallUI::GetDefaultInstallDialogParent() {
-  return NULL;
+  return nullptr;
 }
 
 }  // namespace athena