Const-ify DownloadStatusUpdaterDelegate methods.

content/browser/download/download_manager.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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 234 matching lines @@
 
   FilePath last_download_path() { return last_download_path_; }
 
   // Creates the download item.  Must be called on the UI thread.
   void CreateDownloadItem(DownloadCreateInfo* info);
 
   // Clears the last download path, used to initialize "save as" dialogs.
   void ClearLastDownloadPath();
 
   // Overridden from DownloadStatusUpdaterDelegate:
-  virtual bool IsDownloadProgressKnown();
-  virtual int64 GetInProgressDownloadCount();
-  virtual int64 GetReceivedDownloadBytes();
-  virtual int64 GetTotalDownloadBytes();
+  virtual bool IsDownloadProgressKnown() const OVERRIDE;
+  virtual int64 GetInProgressDownloadCount() const OVERRIDE;
+  virtual int64 GetReceivedDownloadBytes() const OVERRIDE;
+  virtual int64 GetTotalDownloadBytes() const OVERRIDE;
 
   // Called by the delegate after the save as dialog is closed.
   void FileSelected(const FilePath& path, void* params);
   void FileSelectionCanceled(void* params);
 
   // Called by the delegate if it delayed the download in
   // DownloadManagerDelegate::ShouldStartDownload and now is ready.
   void RestartDownload(int32 download_id);
 
   // Mark the download opened in the persistent store.
@@ skipping 165 matching lines @@
   content::DownloadManagerDelegate* delegate_;
 
   // TODO(rdsmith): Remove when http://crbug.com/85408 is fixed.
   // For debugging only.
   int64 largest_db_handle_in_history_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_