Add a browser test for UtilityProcessHost.

content/shell/utility/shell_content_utility_client.h

 // Copyright 2015 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 CONTENT_SHELL_UTILITY_SHELL_CONTENT_UTILITY_CLIENT_H_
 #define CONTENT_SHELL_UTILITY_SHELL_CONTENT_UTILITY_CLIENT_H_
 
 #include "content/public/utility/content_utility_client.h"
 
 namespace content {
 
 class ShellContentUtilityClient : public ContentUtilityClient {
  public:
   ~ShellContentUtilityClient() override;
 
   // ContentUtilityClient:
   void RegisterMojoApplications(StaticMojoApplicationMap* apps) override;
+  void RegisterMojoServices(ServiceRegistry* registry) override;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_UTILITY_SHELL_CONTENT_UTILITY_CLIENT_H_