Download code cleanup:

chrome/browser/download/download_manager.h

 // Copyright (c) 2010 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 profile in Chrome.
 //
 // Download observers:
@@ skipping 227 matching lines @@
 
   // Called when the user has validated the donwload of a dangerous file.
   void DangerousDownloadValidated(DownloadItem* download);
 
   // Used to make sure we have a safe file extension and filename for a
   // download.  |file_name| can either be just the file name or it can be a
   // full path to a file.
   static void GenerateSafeFileName(const std::string& mime_type,
                                    FilePath* file_name);
 
-  // Runs the network cancel.  Must be called on the IO thread.
-  static void OnCancelDownloadRequest(ResourceDispatcherHost* rdh,
-                                      int render_process_id,
-                                      int request_id);
-
   // Create a file name based on the response from the server.
   static void GenerateFileName(const GURL& url,
                                const std::string& content_disposition,
                                const std::string& referrer_charset,
                                const std::string& mime_type,
                                FilePath* generated_name);
 
  private:
   class FakeDbHandleGenerator {
    public:
@@ skipping 201 matching lines @@
   // Downloads are expected to have unique handles, so FakeDbHandleGenerator
   // automatically decrement the handle value on every use.
   FakeDbHandleGenerator fake_db_handle_;
 
   scoped_ptr<OtherDownloadManagerObserver> other_download_manager_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_