Make html_contents_ in BallonViewImpl scoped_ptr.

chrome/browser/chromeos/notifications/balloon_view.h

 // Copyright (c) 2011 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.
 
 // Draws the view for the balloons.
 
 #ifndef CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_BALLOON_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_BALLOON_VIEW_H_
 #pragma once
 
@@ skipping 81 matching lines @@
 
   // Denies the permission to show the ballooon from its source.
   void DenyPermission();
 
   // Returns the renderer's native view.
   gfx::NativeView GetParentNativeView();
 
   // Non-owned pointer to the balloon which owns this object.
   Balloon* balloon_;
 
-  // The renderer of the HTML contents. Pointer owned by the views hierarchy.
-  BalloonViewHost* html_contents_;
+  // The renderer of the HTML contents.
+  scoped_ptr<BalloonViewHost> html_contents_;
 
   // A widget for ControlView.
   scoped_ptr<views::Widget> control_view_host_;
 
   bool stale_;
   content::NotificationRegistrar notification_registrar_;
   // A sticky flag. A sticky notification cannot be dismissed by a user.
   bool sticky_;
   // True if a notification should have info/option/dismiss label/buttons.
   bool controls_;
   // True if the notification is being closed.
   bool closed_;
   // True to enable WebUI in the notification.
   bool web_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(BalloonViewImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NOTIFICATIONS_BALLOON_VIEW_H_