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

chrome/browser/chrome_plugin_message_filter.cc

Index: chrome/browser/chrome_plugin_message_filter.cc
===================================================================
--- chrome/browser/chrome_plugin_message_filter.cc	(revision 86090)
+++ chrome/browser/chrome_plugin_message_filter.cc	(working copy)
@@ -41,10 +41,9 @@
 
 #if defined(OS_WIN)
 void ChromePluginMessageFilter::OnDownloadUrl(const std::string& url,
-                                              int source_pid,
                                               gfx::NativeWindow caller_window) {
   PluginDownloadUrlHelper* download_url_helper =
-      new PluginDownloadUrlHelper(url, source_pid, caller_window, NULL);
+      new PluginDownloadUrlHelper(url, caller_window, NULL);
   download_url_helper->InitiateDownload(
       Profile::GetDefaultRequestContext()->GetURLRequestContext());
 }