[Sync] Replace typedef with using.

chrome/browser/sync/test/integration/sync_app_helper.cc

 // Copyright (c) 2012 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 "chrome/browser/sync/test/integration/sync_app_helper.h"
 
 #include <list>
 #include <map>
 #include <memory>
 
@@ skipping 27 matching lines @@
 
   syncer::StringOrdinal app_launch_ordinal;
   syncer::StringOrdinal page_ordinal;
   extensions::LaunchType launch_type;
   GURL launch_web_url;
   std::string description;
   std::string name;
   bool from_bookmark;
 };
 
-typedef std::map<std::string, AppState> AppStateMap;
+using AppStateMap = std::map<std::string, AppState>;
 
 AppState::AppState()
     : launch_type(extensions::LAUNCH_TYPE_INVALID), from_bookmark(false) {}
 
 AppState::~AppState() {}
 
 bool AppState::IsValid() const {
   return page_ordinal.IsValid() && app_launch_ordinal.IsValid();
 }
 
@@ skipping 158 matching lines @@
       crx_file::id_util::GenerateId(name), app_launch_ordinal);
 }
 
 void SyncAppHelper::FixNTPOrdinalCollisions(Profile* profile) {
   ExtensionSystem::Get(profile)->app_sorting()->FixNTPOrdinalCollisions();
 }
 
 SyncAppHelper::SyncAppHelper() : setup_completed_(false) {}
 
 SyncAppHelper::~SyncAppHelper() {}