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

chrome/browser/plugin_download_helper.cc

 // 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.
 
 #include "chrome/browser/plugin_download_helper.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 
 #include "base/file_util.h"
-#include "chrome/browser/net/url_request_tracking.h"
 #include "net/base/io_buffer.h"
 
 PluginDownloadUrlHelper::PluginDownloadUrlHelper(
     const std::string& download_url,
-    int source_child_unique_id,
     gfx::NativeWindow caller_window,
     PluginDownloadUrlHelper::DownloadDelegate* delegate)
     : download_file_request_(NULL),
       download_file_buffer_(new net::IOBuffer(kDownloadFileBufferSize)),
       download_file_caller_window_(caller_window),
       download_url_(download_url),
-      download_source_child_unique_id_(source_child_unique_id),
       delegate_(delegate) {
   memset(download_file_buffer_->data(), 0, kDownloadFileBufferSize);
   download_file_.reset(new net::FileStream());
 }
 
 PluginDownloadUrlHelper::~PluginDownloadUrlHelper() {
   if (download_file_request_) {
     delete download_file_request_;
     download_file_request_ = NULL;
   }
 }
 
 void PluginDownloadUrlHelper::InitiateDownload(
     net::URLRequestContext* request_context) {
   download_file_request_ = new net::URLRequest(GURL(download_url_), this);
-  chrome_browser_net::SetOriginPIDForRequest(
-      download_source_child_unique_id_, download_file_request_);
   download_file_request_->set_context(request_context);
   download_file_request_->Start();
 }
 
 void PluginDownloadUrlHelper::OnAuthRequired(
     net::URLRequest* request,
     net::AuthChallengeInfo* auth_info) {
   net::URLRequest::Delegate::OnAuthRequired(request, auth_info);
   DownloadCompletedHelper(false);
 }
@@ skipping 126 matching lines @@
       ::SendMessage(download_file_caller_window_, WM_COPYDATA, NULL,
                     reinterpret_cast<LPARAM>(&download_file_data));
     }
   }
 
   // Don't access any members after this.
   delete this;
 }
 
 #endif  // OS_WIN