Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/extension_test_notification_observer.cc

 // Copyright 2013 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 "chrome/browser/extensions/extension_test_notification_observer.h"
 
 #include <stddef.h>
 
 #include "base/callback_list.h"
 #include "chrome/browser/extensions/extension_action_test_util.h"
@@ skipping 266 matching lines @@
     const ConditionCallback& condition,
     NotificationSet* notification_set) {
   if (condition.Run())
     return;
   condition_ = condition;
 
   scoped_refptr<content::MessageLoopRunner> runner(
       new content::MessageLoopRunner);
   quit_closure_ = runner->QuitClosure();
 
-  scoped_ptr<base::CallbackList<void()>::Subscription> subscription;
+  std::unique_ptr<base::CallbackList<void()>::Subscription> subscription;
   if (notification_set) {
     subscription = notification_set->callback_list().Add(
         base::Bind(&ExtensionTestNotificationObserver::MaybeQuit,
                    base::Unretained(this)));
   }
   runner->Run();
 
   condition_.Reset();
   quit_closure_.Reset();
 }
 
 void ExtensionTestNotificationObserver::MaybeQuit() {
   if (condition_.Run())
     quit_closure_.Run();
 }