[Sync] Fixing easy lint violations.

chrome/browser/sync/test/integration/sync_arc_package_helper.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 CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_ARC_PACKAGE_HELPER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_ARC_PACKAGE_HELPER_H_
 
+#include <memory>
+#include <string>
 #include <unordered_map>
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "components/arc/common/app.mojom.h"
 
 class Profile;
 class SyncTest;
 
-namespace arc{
+namespace arc {
 class FakeAppInstance;
 }
 
 namespace chromeos {
 class ScopedUserManagerEnabler;
 }
 
 namespace arc {
 
 class SyncArcPackageHelper {
@@ skipping 39 matching lines @@
   std::unordered_map<Profile*, std::unique_ptr<FakeAppInstance>> instance_map_;
 
   std::unique_ptr<chromeos::ScopedUserManagerEnabler> user_manager_enabler_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncArcPackageHelper);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_ARC_PACKAGE_HELPER_H_