Disable tracing in user service

services/user/user_shell_client.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/user/user_shell_client.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/weak_ptr.h"
 #include "components/filesystem/lock_table.h"
@@ skipping 74 matching lines @@
       leveldb_service_runner_(std::move(leveldb_service_runner)) {}
 
 UserShellClient::~UserShellClient() {
   user_service_runner_->DeleteSoon(FROM_HERE, user_objects_.release());
   leveldb_service_runner_->DeleteSoon(FROM_HERE, leveldb_objects_.release());
 }
 
 void UserShellClient::Initialize(shell::Connector* connector,
                                  const shell::Identity& identity,
                                  uint32_t id) {
-  tracing_.Initialize(connector, identity.name());
   user_objects_.reset(new UserShellClient::UserServiceObjects(
       GetUserDirForUserID(identity.user_id())));
   leveldb_objects_.reset(
       new UserShellClient::LevelDBServiceObjects(leveldb_service_runner_));
 }
 
 bool UserShellClient::AcceptConnection(shell::Connection* connection) {
   connection->AddInterface<leveldb::LevelDBService>(this);
   connection->AddInterface<mojom::UserService>(this);
   return true;
@@ skipping 12 matching lines @@
                              leveldb::LevelDBServiceRequest request) {
   leveldb_service_runner_->PostTask(
       FROM_HERE,
       base::Bind(
           &UserShellClient::LevelDBServiceObjects::OnLevelDBServiceRequest,
           leveldb_objects_->AsWeakPtr(), connection,
           base::Passed(&request)));
 }
 
 }  // namespace user_service