mojo: Use TYPE_DEFAULT message-loop for browser-tests.

services/shell/public/cpp/service_runner.h

 // Copyright 2014 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.
 
 #ifndef SERVICES_SHELL_PUBLIC_CPP_SERVICE_RUNNER_H_
 #define SERVICES_SHELL_PUBLIC_CPP_SERVICE_RUNNER_H_
 
 #include <memory>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 43 matching lines @@
   // and handle requests from others.
   void DestroyServiceContext();
 
   // Allows the caller to explicitly quit the service. Must be called from
   // the thread which created the ServiceRunner.
   void Quit();
 
  private:
   std::unique_ptr<Service> service_;
 
-  // MessageLoop type. TYPE_CUSTOM is default (MessagePumpMojo will be used as
-  // the underlying message pump).
+  // MessageLoop type. Default is TYPE_DEFAULT.
   base::MessageLoop::Type message_loop_type_;
   // Whether Run() has been called.
   bool has_run_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceRunner);
 };
 
 }  // namespace shell
 
 #endif  // SERVICES_SHELL_PUBLIC_CPP_SERVICE_RUNNER_H_