Disable tracing in user service

services/user/user_shell_client.h

 // 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.
 
 #ifndef SERVICES_USER_USER_SHELL_CLIENT_H_
 #define SERVICES_USER_USER_SHELL_CLIENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "components/filesystem/lock_table.h"
 #include "components/leveldb/public/interfaces/leveldb.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/shell/public/cpp/interface_factory.h"
 #include "services/shell/public/cpp/shell_client.h"
-#include "services/tracing/public/cpp/tracing_impl.h"
 #include "services/user/public/interfaces/user_service.mojom.h"
 
 namespace user_service {
 
 std::unique_ptr<shell::ShellClient> CreateUserShellClient(
     scoped_refptr<base::SingleThreadTaskRunner> user_service_runner,
     scoped_refptr<base::SingleThreadTaskRunner> leveldb_service_runner,
     const base::Closure& quit_closure);
 
 class UserShellClient
@@ skipping 21 matching lines @@
   void Create(shell::Connection* connection,
               leveldb::LevelDBServiceRequest request) override;
 
   void OnLevelDBServiceRequest(shell::Connection* connection,
                                leveldb::LevelDBServiceRequest request);
   void OnLevelDBServiceError();
 
   scoped_refptr<base::SingleThreadTaskRunner> user_service_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> leveldb_service_runner_;
 
-  mojo::TracingImpl tracing_;
-
   // We create these two objects so we can delete them on the correct task
   // runners.
   class UserServiceObjects;
   std::unique_ptr<UserServiceObjects> user_objects_;
 
   class LevelDBServiceObjects;
   std::unique_ptr<LevelDBServiceObjects> leveldb_objects_;
 
   DISALLOW_COPY_AND_ASSIGN(UserShellClient);
 };
 
 }  // namespace user_service
 
 #endif  // SERVICES_USER_USER_SHELL_CLIENT_H_