NULL -> nullptr under athena/

athena/extensions/shell/athena_shell_app_delegate.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/shell/athena_shell_app_delegate.h"
 
 #include "content/public/browser/web_contents.h"
 #include "extensions/shell/browser/media_capture_util.h"
 
 namespace athena {
 
 AthenaShellAppDelegate::AthenaShellAppDelegate() {
 }
 
 AthenaShellAppDelegate::~AthenaShellAppDelegate() {
 }
 
 void AthenaShellAppDelegate::InitWebContents(
     content::WebContents* web_contents) {
   // TODO(oshima): Enable Favicon, Printing, e c. See
   // athena_chrome_app_delegate.cc.
   NOTIMPLEMENTED();
 }
 
 content::ColorChooser* AthenaShellAppDelegate::ShowColorChooser(
     content::WebContents* web_contents,
     SkColor initial_color) {
   NOTIMPLEMENTED();
-  return NULL;
+  return nullptr;
 }
 
 void AthenaShellAppDelegate::RunFileChooser(
     content::WebContents* tab,
     const content::FileChooserParams& params) {
   NOTIMPLEMENTED();
 }
 
 void AthenaShellAppDelegate::RequestMediaAccessPermission(
     content::WebContents* web_contents,
@@ skipping 12 matching lines @@
   extensions::media_capture_util::VerifyMediaAccessPermission(type, extension);
   return true;
 }
 
 void AthenaShellAppDelegate::SetWebContentsBlocked(
     content::WebContents* web_contents,
     bool blocked) {
   NOTIMPLEMENTED();
 }
 }  // namespace athena