NULL -> nullptr under athena/

athena/extensions/chrome/extensions_delegate_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/extensions/public/extensions_delegate.h"
 
 #include "athena/extensions/chrome/athena_chrome_app_window_client.h"
 #include "athena/extensions/chrome/athena_extension_install_ui.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 14 matching lines @@
 
 class ChromeExtensionsDelegate : public ExtensionsDelegate {
  public:
   explicit ChromeExtensionsDelegate(content::BrowserContext* context)
       : extension_service_(
             extensions::ExtensionSystem::Get(context)->extension_service()) {
     extensions::AppWindowClient::Set(&app_window_client_);
   }
 
   virtual ~ChromeExtensionsDelegate() {
-    extensions::AppWindowClient::Set(NULL);
+    extensions::AppWindowClient::Set(nullptr);
   }
 
  private:
   // ExtensionsDelegate:
   virtual content::BrowserContext* GetBrowserContext() const override {
     return extension_service_->GetBrowserContext();
   }
   virtual const extensions::ExtensionSet& GetInstalledExtensions() override {
     return *extension_service_->extensions();
   }
@@ skipping 57 matching lines @@
 
 }  // namespace
 
 // static
 void ExtensionsDelegate::CreateExtensionsDelegate(
     content::BrowserContext* context) {
   new ChromeExtensionsDelegate(context);
 }
 
 }  // namespace athena