Remove BrowserThread::UnsafeGetBrowserThread, add UnsafeGetMessageLoopForThread.

chrome/browser/printing/printer_manager_dialog_win.cc

 // Copyright (c) 2011 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/printing/printer_manager_dialog.h"
 
 #include <windows.h>
 #include <shellapi.h>
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/path_service.h"
 #include "base/threading/thread.h"
 #include "chrome/browser/browser_process.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
 
 namespace printing {
 
 // A helper callback that opens the printer management dialog.
 void OpenPrintersDialogCallback() {
   FilePath sys_dir;
   PathService::Get(base::DIR_SYSTEM, &sys_dir);
   FilePath rundll32 = sys_dir.AppendASCII("rundll32.exe");
   FilePath shell32dll = sys_dir.AppendASCII("shell32.dll");
 
   std::wstring args(shell32dll.value());
   args.append(L",SHHelpShortcuts_RunDLL PrintersFolder");
   ShellExecute(NULL, L"open", rundll32.value().c_str(), args.c_str(), NULL,
                SW_SHOWNORMAL);
 }
 
 void PrinterManagerDialog::ShowPrinterManagerDialog() {
-  g_browser_process->file_thread()->message_loop()->PostTask(
-      FROM_HERE, base::Bind(OpenPrintersDialogCallback));
+  BrowserThread::PostTask(
+      BrowserThread::FILE,
+      FROM_HERE,
+      base::Bind(OpenPrintersDialogCallback));
 }
 
 }  // namespace printing