Remove calls to deprecated MessageLoop methods in gin.

gin/shell/gin_main.cc

 // Copyright 2013 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 "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/files/file_util.h"
 #include "base/i18n/icu_util.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "gin/array_buffer.h"
 #include "gin/modules/console.h"
 #include "gin/modules/module_runner_delegate.h"
 #include "gin/public/isolate_holder.h"
 #include "gin/try_catch.h"
 #include "gin/v8_initializer.h"
 
 namespace gin {
@@ skipping 69 matching lines @@
 
   base::CommandLine::StringVector args =
       base::CommandLine::ForCurrentProcess()->GetArgs();
   for (base::CommandLine::StringVector::const_iterator it = args.begin();
        it != args.end(); ++it) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(gin::Run, runner.GetWeakPtr(), base::FilePath(*it)));
   }
 
-  message_loop.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
   return 0;
 }