Change DownloadProcessHandle to be more of an encapsulated class.

chrome/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 profile in Chrome.
 //
 // Download observers:
@@ skipping 106 matching lines @@
   // Notifications sent from the download thread to the UI thread
   void StartDownload(int32 id);
   void UpdateDownload(int32 download_id, int64 size);
   // |hash| is sha256 hash for the downloaded file. It is empty when the hash
   // is not available.
   void OnResponseCompleted(int32 download_id, int64 size, int os_error,
                            const std::string& hash);
 
   // Called from a view when a user clicks a UI button or link.
   void DownloadCancelled(int32 download_id);
-  void PauseDownload(int32 download_id, bool pause);
   void RemoveDownload(int64 download_handle);
 
   // Determine if the download is ready for completion, i.e. has had
   // all data saved, and completed the filename determination and
   // history insertion.
   bool IsDownloadReadyForCompletion(DownloadItem* download);
 
   // If all pre-requisites have been met, complete download processing, i.e.
   // do internal cleanup, file rename, and potentially auto-open.
   // (Dangerous downloads still may block on user acceptance after this
@@ skipping 170 matching lines @@
   // |hash| is sha256 hash for the downloaded file. It is empty when the hash
   // is not available.
   void OnAllDataSaved(int32 download_id, int64 size, const std::string& hash);
 
   // An error occurred in the download.
   void OnDownloadError(int32 download_id, int64 size, int os_error);
 
   // Updates the app icon about the overall download progress.
   void UpdateAppIcon();
 
-  // Makes the ResourceDispatcherHost pause/un-pause a download request.
-  // Called on the IO thread.
-  // |process_handle| is passed by value because this is called from other
-  // threads, and this way we don't have to worry about object lifetimes.
-  void PauseDownloadRequest(ResourceDispatcherHost* rdh,
-                            DownloadProcessHandle process_handle,
-                            bool pause);
-
   // Inform observers that the model has changed.
   void NotifyModelChanged();
 
   // Get the download item from the history map.  Useful after the item has
   // been removed from the active map, or was retrieved from the history DB.
   DownloadItem* GetDownloadItem(int id);
 
   // Get the download item from the active map.  Useful when the item is not
   // yet in the history map.
   DownloadItem* GetActiveDownloadItem(int id);
@@ skipping 75 matching lines @@
   // The "Save As" dialog box used to ask the user where a file should be
   // saved.
   scoped_refptr<SelectFileDialog> select_file_dialog_;
 
   scoped_ptr<OtherDownloadManagerObserver> other_download_manager_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManager);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_MANAGER_H_