Convert //ash from scoped_ptr to std::unique_ptr

ash/system/web_notification/web_notification_tray.cc

 // Copyright (c) 2012 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 "ash/system/web_notification/web_notification_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
@@ skipping 85 matching lines @@
     bubble_view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
     bubble->InitializeContents(bubble_view);
   }
 
   message_center::MessageBubbleBase* bubble() const { return bubble_.get(); }
 
   // Convenience accessors.
   views::TrayBubbleView* bubble_view() const { return bubble_->bubble_view(); }
 
  private:
-  scoped_ptr<message_center::MessageBubbleBase> bubble_;
-  scoped_ptr<TrayBubbleWrapper> bubble_wrapper_;
+  std::unique_ptr<message_center::MessageBubbleBase> bubble_;
+  std::unique_ptr<TrayBubbleWrapper> bubble_wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(WebNotificationBubbleWrapper);
 };
 
 class WebNotificationButton : public views::CustomButton {
  public:
   WebNotificationButton(views::ButtonListener* listener)
       : views::CustomButton(listener),
         is_bubble_visible_(false),
         unread_count_(0) {
@@ skipping 370 matching lines @@
 
 message_center::MessageCenterBubble*
 WebNotificationTray::GetMessageCenterBubbleForTest() {
   if (!message_center_bubble())
     return NULL;
   return static_cast<message_center::MessageCenterBubble*>(
       message_center_bubble()->bubble());
 }
 
 }  // namespace ash