Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_util.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.
 //
 // Download utilities.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 #pragma once
 
@@ skipping 230 matching lines @@
 // Download the URL. Must be called on the IO thread.
 void DownloadUrl(const GURL& url,
                  const GURL& referrer,
                  const std::string& referrer_charset,
                  const DownloadSaveInfo& save_info,
                  ResourceDispatcherHost* rdh,
                  int render_process_host_id,
                  int render_view_id,
                  const content::ResourceContext* context);
 
-// Tells the resource dispatcher host to cancel a download request.
-// Must be called on the IO thread.
-// |process_handle| is passed by value because it is ultimately passed to
-// other threads, and this way we don't have to worry about object lifetimes.
-void CancelDownloadRequest(ResourceDispatcherHost* rdh,
-                           DownloadProcessHandle process_handle);
-
 // Sends a notification on downloads being initiated
 // Must be called on the UI thread.
 void NotifyDownloadInitiated(int render_process_id, int render_view_id);
 
 // Same as GetUniquePathNumber, except that it also checks the existence
 // of its .crdownload intermediate path.
 // If |path| does not exist, 0 is returned.  If it fails to find such
 // a number, -1 is returned.
 int GetUniquePathNumberWithCrDownload(const FilePath& path);
 
 // Erases all downloaded files with the specified path and name prefix.
 // Used by download UI tests to clean up the download directory.
 void EraseUniqueDownloadFiles(const FilePath& path_prefix);
 
 // Returns a .crdownload intermediate path for the |suggested_path|.
 FilePath GetCrDownloadPath(const FilePath& suggested_path);
 
 }  // namespace download_util
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_