Move download stuff to download tab helper.

chrome/browser/download/download_process_handle.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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_PROCESS_HANDLE_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_PROCESS_HANDLE_H_
 #pragma once
 
 class DownloadManager;
 class ResourceDispatcherHost;
 class TabContents;
+class TabContentsWrapper;
 
 // A handle used by the download system for operations on external
 // objects associated with the download (e.g. URLRequest, TabContents,
 // DownloadManager).
 // This class needs to be copyable, so we can pass it across threads and not
 // worry about lifetime or const-ness.
 class DownloadProcessHandle {
  public:
   DownloadProcessHandle();
   DownloadProcessHandle(int child_id, int render_view_id, int request_id);
 
   // These functions must be called on the UI thread.
   TabContents* GetTabContents();
+  TabContentsWrapper* GetTabContentsWrapper();
   DownloadManager* GetDownloadManager();
 
   int child_id() const { return child_id_; }
   int render_view_id() const { return render_view_id_; }
   int request_id() const { return request_id_; }
 
  private:
   // The ID of the child process that started the download.
   int child_id_;
 
   // The ID of the render view that started the download.
   int render_view_id_;
 
   // The ID associated with the request used for the download.
   int request_id_;
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_PROCESS_HANDLE_H_