Fix "unused variable" warnings.

services/shell/shell.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_SHELL_H_
 #define SERVICES_SHELL_SHELL_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 132 matching lines @@
 
   base::WeakPtr<Shell> GetWeakPtr();
 
   std::map<Identity, Instance*> identity_to_instance_;
 
   // Tracks the names of instances that are allowed to field connection requests
   // from all users.
   std::set<std::string> singletons_;
 
   std::map<Identity, mojom::ShellClientFactoryPtr> shell_client_factories_;
-  // Counter used to assign ids to client factories.
-  uint32_t shell_client_factory_id_counter_;
-
   std::map<Identity, mojom::ShellResolverPtr> identity_to_resolver_;
-
   mojo::InterfacePtrSet<mojom::InstanceListener> instance_listeners_;
-
   base::Callback<void(const Identity&)> instance_quit_callback_;
   std::unique_ptr<NativeRunnerFactory> native_runner_factory_;
   std::unique_ptr<ShellConnection> shell_connection_;
   base::WeakPtrFactory<Shell> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 mojom::Connector::ConnectCallback EmptyConnectCallback();
 
 }  // namespace shell
 
 #endif  // SERVICES_SHELL_SHELL_H_