Remove calls to deprecated MessageLoop methods in chrome.

chrome/utility/importer/firefox_importer_unittest_utils_mac.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/utility/importer/firefox_importer_unittest_utils.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
 #include "base/posix/global_descriptors.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/common/importer/firefox_importer_utils.h"
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_descriptors.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_multiprocess_test.h"
 #include "testing/multiprocess_func_list.h"
@@ skipping 257 matching lines @@
 MULTIPROCESS_IPC_TEST_MAIN(NSSDecrypterChildProcess) {
   base::MessageLoopForIO main_message_loop;
   FFDecryptorClientChannelListener listener;
 
   std::unique_ptr<IPC::Channel> channel =
       IPC::Channel::CreateClient(kTestChannelID, &listener);
   CHECK(channel->Connect());
   listener.SetSender(channel.get());
 
   // run message loop
-  base::MessageLoop::current()->Run();
+  base::RunLoop().Run();
 
   return 0;
 }