Get rid of url_request_tracking.*. The only other place that used it other than ResourceDispatch...

chrome/browser/plugin_download_helper.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_PLUGIN_DOWNLOAD_HELPER_H_
 #define CHROME_BROWSER_PLUGIN_DOWNLOAD_HELPER_H_
 #pragma once
 
 #include <string>
 #include "build/build_config.h"
@@ skipping 14 matching lines @@
   // initiated.
   class DownloadDelegate {
    public:
     virtual ~DownloadDelegate() {}
 
     virtual void OnDownloadCompleted(const FilePath& download_path,
                                      bool success) {}
   };
 
   PluginDownloadUrlHelper(const std::string& download_url,
-                          int source_pid, gfx::NativeWindow caller_window,
+                          gfx::NativeWindow caller_window,
                           PluginDownloadUrlHelper::DownloadDelegate* delegate);
   ~PluginDownloadUrlHelper();
 
   void InitiateDownload(net::URLRequestContext* request_context);
 
   // net::URLRequest::Delegate
   virtual void OnAuthRequired(net::URLRequest* request,
                               net::AuthChallengeInfo* auth_info);
   virtual void OnSSLCertificateError(net::URLRequest* request,
                                      int cert_error,
@@ skipping 13 matching lines @@
   // The full path of the downloaded file.
   FilePath download_file_path_;
   // The buffer passed off to net::URLRequest::Read.
   scoped_refptr<net::IOBuffer> download_file_buffer_;
   // TODO(port): this comment doesn't describe the situation on Posix.
   // The window handle for sending the WM_COPYDATA notification,
   // indicating that the download completed.
   gfx::NativeWindow download_file_caller_window_;
 
   std::string download_url_;
-  int download_source_child_unique_id_;
 
   PluginDownloadUrlHelper::DownloadDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDownloadUrlHelper);
 };
 
 #endif  // OS_WIN
 
 #endif  // CHROME_BROWSER_PLUGIN_DOWNLOAD_HELPER_H_