Don't download extensions updates when background networking is disabled

extensions/browser/updater/extension_downloader.cc

 // Copyright (c) 2012 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 "extensions/browser/updater/extension_downloader.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 422 matching lines @@
 }
 
 void ExtensionDownloader::StartUpdateCheck(
     scoped_ptr<ManifestFetchData> fetch_data) {
   const std::set<std::string>& id_set(fetch_data->extension_ids());
 
   if (!ExtensionsBrowserClient::Get()->IsBackgroundUpdateAllowed()) {
     NotifyExtensionsDownloadFailed(id_set,
                                    fetch_data->request_ids(),
                                    ExtensionDownloaderDelegate::DISABLED);
+    return;
   }
 
   RequestQueue<ManifestFetchData>::iterator i;
   for (i = manifests_queue_.begin(); i != manifests_queue_.end(); ++i) {
     if (fetch_data->full_url() == i->full_url()) {
       // This url is already scheduled to be fetched.
       i->Merge(*fetch_data);
       return;
     }
   }
@@ skipping 515 matching lines @@
     const GURL& update_url,
     int request_id) {
   ManifestFetchData::PingMode ping_mode = ManifestFetchData::NO_PING;
   if (update_url.DomainIs(ping_enabled_domain_.c_str()))
     ping_mode = ManifestFetchData::PING_WITH_ENABLED_STATE;
   return new ManifestFetchData(
       update_url, request_id, brand_code_, manifest_query_params_, ping_mode);
 }
 
 }  // namespace extensions