[Sync] Replace typedef with using.

chrome/browser/sync/test/integration/sync_extension_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_EXTENSION_HELPER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_EXTENSION_HELPER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 76 matching lines @@
 
     ExtensionState();
     ~ExtensionState();
     bool Equals(const ExtensionState &other) const;
 
     EnabledState enabled_state;
     int disable_reasons;
     bool incognito_enabled;
   };
 
-  typedef std::map<std::string, ExtensionState> ExtensionStateMap;
-  typedef std::map<std::string, scoped_refptr<extensions::Extension> >
-      ExtensionNameMap;
-  typedef std::map<Profile*, ExtensionNameMap> ProfileExtensionNameMap;
-  typedef std::map<std::string, std::string> StringMap;
-  typedef std::map<std::string, extensions::Manifest::Type> TypeMap;
+  using ExtensionStateMap = std::map<std::string, ExtensionState>;
+  using ExtensionNameMap =
+      std::map<std::string, scoped_refptr<extensions::Extension>>;
+  using ProfileExtensionNameMap = std::map<Profile*, ExtensionNameMap>;
+  using StringMap = std::map<std::string, std::string>;
+  using TypeMap = std::map<std::string, extensions::Manifest::Type>;
 
   friend struct base::DefaultSingletonTraits<SyncExtensionHelper>;
 
   SyncExtensionHelper();
   ~SyncExtensionHelper();
 
   // Returns a map from |profile|'s installed extensions to their state.
   static ExtensionStateMap GetExtensionStates(Profile* profile);
 
   // Initializes extensions for |profile| and creates an entry in
@@ skipping 10 matching lines @@
   std::string extension_name_prefix_;
   ProfileExtensionNameMap profile_extensions_;
   StringMap id_to_name_;
   TypeMap id_to_type_;
   bool setup_completed_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncExtensionHelper);
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_SYNC_EXTENSION_HELPER_H_