Remove remaining calls to deprecated MessageLoop methods on Mac.

services/shell/background/background_shell.cc

 // Copyright 2016 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 "services/shell/background/background_shell.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_pump_default.h"
 #include "base/path_service.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/simple_thread.h"
 #include "services/catalog/store.h"
 #include "services/shell/connect_params.h"
 #include "services/shell/public/cpp/service.h"
 #include "services/shell/public/cpp/service_context.h"
 #include "services/shell/service_manager.h"
 #include "services/shell/standalone/context.h"
 
@@ skipping 79 matching lines @@
     }
     if (context_init_params->init_edk)
       Context::EnsureEmbedderIsInitialized();
 
     message_loop_->BindToCurrentThread();
 
     std::unique_ptr<Context> context(new Context);
     context_ = context.get();
     context_->Init(std::move(context_init_params));
 
-    message_loop_->Run();
+    base::RunLoop().Run();
 
     // Has to happen after run, but while messageloop still valid.
     context_->Shutdown();
 
     // Context has to be destroyed after the MessageLoop has been destroyed.
     message_loop.reset();
     context_ = nullptr;
   }
 
  private:
@@ skipping 44 matching lines @@
 }
 
 void BackgroundShell::ExecuteOnServiceManagerThread(
     const ServiceManagerThreadCallback& callback) {
   thread_->message_loop()->task_runner()->PostTask(
       FROM_HERE, base::Bind(&MojoThread::RunServiceManagerCallback,
                             base::Unretained(thread_.get()), callback));
 }
 
 }  // namespace shell