Replace MessageLoop::current()->task_runner() with ThreadTaskRunnerHandle::Get().

components/leveldb/leveldb_app.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 "components/leveldb/leveldb_app.h"
 
-#include "base/message_loop/message_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "components/leveldb/leveldb_service_impl.h"
 #include "services/shell/public/cpp/interface_registry.h"
 
 namespace leveldb {
 
 LevelDBApp::LevelDBApp() {}
 
 LevelDBApp::~LevelDBApp() {}
 
 void LevelDBApp::OnStart(const shell::Identity& identity) {
   tracing_.Initialize(connector(), identity.name());
 }
 
 bool LevelDBApp::OnConnect(const shell::Identity& remote_identity,
                            shell::InterfaceRegistry* registry) {
   registry->AddInterface<mojom::LevelDBService>(this);
   return true;
 }
 
 void LevelDBApp::Create(const shell::Identity& remote_identity,
                         leveldb::mojom::LevelDBServiceRequest request) {
   if (!service_)
-    service_.reset(
-        new LevelDBServiceImpl(base::MessageLoop::current()->task_runner()));
+    service_.reset(new LevelDBServiceImpl(base::ThreadTaskRunnerHandle::Get()));
   bindings_.AddBinding(service_.get(), std::move(request));
 }
 
 }  // namespace leveldb