Update first download notification correctly if there are multiple notifications

chrome/browser/download/notification/download_item_notification.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_ITEM_NOTIFICATION_H_
 #define CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_ITEM_NOTIFICATION_H_
 
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/download/download_commands.h"
 #include "chrome/browser/download/notification/download_notification.h"
@@ skipping 87 matching lines @@
 
   Browser* GetBrowser() const;
   Profile* profile() const;
 
   // Returns the list of possible extra (all except the default) actions.
   scoped_ptr<std::vector<DownloadCommands::Command>> GetExtraActions() const;
 
   // Flag to show the notification on next update. If true, the notification
   // goes visible. The initial value is true so it gets shown on initial update.
   bool show_next_ = true;
-  // Current vilibility status of the notification.
-  bool visible_ = false;
 
   int image_resource_id_ = 0;
   std::pair<gfx::VectorIconId, SkColor> vector_icon_params_;
   content::DownloadItem::DownloadState previous_download_state_ =
       content::DownloadItem::MAX_DOWNLOAD_STATE;  // As uninitialized state
   bool previous_dangerous_state_ = false;
   scoped_ptr<Notification> notification_;
   content::DownloadItem* item_;
   scoped_ptr<std::vector<DownloadCommands::Command>> button_actions_;
 
   // Status of the preview image decode.
   ImageDecodeStatus image_decode_status_ = NOT_STARTED;
 
+  // Pointer to the message center instance.
+  message_center::MessageCenter* message_center_;
+
+  void SetMessageCenterForTest(
+      message_center::MessageCenter* message_center);
+
   base::WeakPtrFactory<DownloadItemNotification> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadItemNotification);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_NOTIFICATION_DOWNLOAD_ITEM_NOTIFICATION_H_