Remove all remaining traces of MessageLoopProxy.

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 <stddef.h>
 
 #include <utility>
 
@@ skipping 730 matching lines @@
   bool is_secure = fetch->url.SchemeIsCryptographic();
   if (fetch->credentials != ExtensionFetch::CREDENTIALS_COOKIES || !is_secure) {
     load_flags |= net::LOAD_DO_NOT_SEND_COOKIES | net::LOAD_DO_NOT_SAVE_COOKIES;
   }
   extension_fetcher_->SetLoadFlags(load_flags);
 
   // Download CRX files to a temp file. The blacklist is small and will be
   // processed in memory, so it is fetched into a string.
   if (fetch->id != kBlacklistAppID) {
     extension_fetcher_->SaveResponseToTemporaryFile(
-        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE));
   }
 
   if (fetch->credentials == ExtensionFetch::CREDENTIALS_OAUTH2_TOKEN &&
       is_secure) {
     if (access_token_.empty()) {
       // We should try OAuth2, but we have no token cached. This
       // ExtensionFetcher will be started once the token fetch is complete,
       // in either OnTokenFetchSuccess or OnTokenFetchFailure.
       DCHECK(identity_provider_.get());
       OAuth2TokenService::ScopeSet webstore_scopes;
@@ skipping 178 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