Run clang-modernize -use-nullptr over src/extensions/.

extensions/shell/browser/shell_extension_host_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 "extensions/shell/browser/shell_extension_host_delegate.h"
 
 #include "base/logging.h"
 #include "extensions/shell/browser/media_capture_util.h"
 #include "extensions/shell/browser/shell_extension_web_contents_observer.h"
 
@@ skipping 12 matching lines @@
 
 void ShellExtensionHostDelegate::OnRenderViewCreatedForBackgroundPage(
     ExtensionHost* host) {
 }
 
 content::JavaScriptDialogManager*
 ShellExtensionHostDelegate::GetJavaScriptDialogManager() {
   // TODO(jamescook): Create a JavaScriptDialogManager or reuse the one from
   // content_shell.
   NOTREACHED();
-  return NULL;
+  return nullptr;
 }
 
 void ShellExtensionHostDelegate::CreateTab(content::WebContents* web_contents,
                                            const std::string& extension_id,
                                            WindowOpenDisposition disposition,
                                            const gfx::Rect& initial_pos,
                                            bool user_gesture) {
   // TODO(jamescook): Should app_shell support opening popup windows?
   NOTREACHED();
 }
@@ skipping 11 matching lines @@
 bool ShellExtensionHostDelegate::CheckMediaAccessPermission(
     content::WebContents* web_contents,
     const GURL& security_origin,
     content::MediaStreamType type,
     const Extension* extension) {
   media_capture_util::VerifyMediaAccessPermission(type, extension);
   return true;
 }
 
 }  // namespace extensions