Implement Windows GPO support for "dlpref" in component updater.

components/update_client/ping_manager.cc

 // Copyright 2014 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 "components/update_client/ping_manager.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
@@ skipping 116 matching lines @@
   const std::string app_element(base::StringPrintf(
       app_element_format,
       item->id.c_str(),                                    // "appid"
       item->previous_version.GetString().c_str(),          // "version"
       item->next_version.GetString().c_str(),              // "nextversion"
       BuildUpdateCompleteEventElement(item).c_str(),       // update event
       BuildDownloadCompleteEventElements(item).c_str()));  // download events
 
   return BuildProtocolRequest(config.GetBrowserVersion().GetString(),
                               config.GetChannel(), config.GetLang(),
-                              config.GetOSLongName(), app_element, "");
+                              config.GetOSLongName(),
+                              config.GetDownloadPreference(), app_element, "");
 }
 
 // Sends a fire and forget ping. The instances of this class have no
 // ownership and they self-delete upon completion. One instance of this class
 // can send only one ping.
 class PingSender {
  public:
   explicit PingSender(const scoped_refptr<Configurator>& config);
   ~PingSender();
 
@@ skipping 47 matching lines @@
 
 // Sends a fire and forget ping when the updates are complete. The ping
 // sender object self-deletes after sending the ping has completed asynchrously.
 void PingManager::OnUpdateComplete(const CrxUpdateItem* item) {
   PingSender* ping_sender(new PingSender(config_));
   if (!ping_sender->SendPing(item))
     delete ping_sender;
 }
 
 }  // namespace update_client