[Sync] Replace typedef with using.

chrome/browser/ui/sync/one_click_signin_sync_starter.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_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_STARTER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_STARTER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 79 matching lines @@
     // Display a confirmation after signing in.
     CONFIRM_AFTER_SIGNIN
   };
 
   // Result of the sync setup.
   enum SyncSetupResult {
     SYNC_SETUP_SUCCESS,
     SYNC_SETUP_FAILURE
   };
 
-  typedef base::Callback<void(SyncSetupResult)> Callback;
+  using Callback = base::Callback<void(SyncSetupResult)>;
 
   // |profile| must not be NULL, however |browser| can be. When using the
   // OneClickSigninSyncStarter from a browser, provide both.
   // If |display_confirmation| is true, the user will be prompted to confirm the
   // signin before signin completes.
   // |web_contents| is used to show the sync UI if it's showing a blank page
   // and not about to be closed. It can be NULL.
   // If |web_contents| is non-NULL and the |continue_url| is non-empty, the
   // |web_contents| will be navigated to the |continue_url| once both signin and
   // Sync setup are complete.
@@ skipping 149 matching lines @@
   // Prevents Sync from running until configuration is complete.
   std::unique_ptr<syncer::SyncSetupInProgressHandle> sync_blocker_;
 
   base::WeakPtrFactory<OneClickSigninSyncStarter> weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninSyncStarter);
 };
 
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_STARTER_H_