Remove all remaining traces of MessageLoopProxy.

chrome/browser/ui/webui/help/version_updater_win.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 "chrome/browser/ui/webui/help/version_updater_win.h"
 
 #include "base/memory/weak_ptr.h"
 #include "base/task_runner_util.h"
 #include "base/win/win_util.h"
 #include "base/win/windows_version.h"
@@ skipping 97 matching lines @@
         message = l10n_util::GetStringFUTF16(
             IDS_ABOUT_BOX_ERROR_DURING_UPDATE_CHECK, html_error_message);
       }
       break;
   }
   callback_.Run(status, 0, message);
 }
 
 void VersionUpdaterWin::BeginUpdateCheckOnFileThread(
     bool install_update_if_possible) {
-  BeginUpdateCheck(content::BrowserThread::GetMessageLoopProxyForThread(
+  BeginUpdateCheck(content::BrowserThread::GetTaskRunnerForThread(
                        content::BrowserThread::FILE),
                    g_browser_process->GetApplicationLocale(),
                    install_update_if_possible, owner_widget_,
                    weak_factory_.GetWeakPtr());
 }
 
 void VersionUpdaterWin::OnPendingRestartCheck(bool is_update_pending_restart) {
   callback_.Run(is_update_pending_restart ? NEARLY_UPDATED : UPDATED, 0,
                 base::string16());
 }
 
 VersionUpdater* VersionUpdater::Create(content::WebContents* web_contents) {
   // Retrieve the HWND for the browser window that is hosting the update check.
   // This will be used as the parent for a UAC prompt, if needed. It's possible
   // this this window will no longer have focus by the time UAC is needed. In
   // that case, the UAC prompt will appear in the taskbar and will require a
   // user click. This is the least surprising thing we can do for the user, and
   // is the intended behavior for Windows applications.
   // It's also possible that the browser window hosting the update check will
   // have been closed by the time the UAC prompt is needed. In this case, the
   // web contents may no longer be hosted in a window, leading either
   // GetTopLevelNativeWindow or GetHost to return null. Passing nullptr to
   // VersionUpdaterWin will then also cause the UAC prompt to appear in the task
   // bar.
   gfx::NativeWindow window = web_contents->GetTopLevelNativeWindow();
   aura::WindowTreeHost* window_tree_host = window ? window->GetHost() : nullptr;
   return new VersionUpdaterWin(
       window_tree_host ? window_tree_host->GetAcceleratedWidget() : nullptr);
 }