Only handle the first AccountAddedToCookie event in OneClickSigninSyncStarter

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 <string>
 
 #include "base/callback_forward.h"
@@ skipping 215 matching lines @@
   GURL continue_url_;
 
   // Callback executed when sync setup succeeds or fails.
   Callback sync_setup_completed_callback_;
 
   // Policy credentials we keep while determining whether to create
   // a new profile for an enterprise user or not.
   std::string dm_token_;
   std::string client_id_;
 
+  // This only cares about the first AccountAddedToCookie event. Since
+  // SigninTracker always expects an observer, this object will just disregard
+  // following AccountAddedToCookie calls triggered by account reconciliation.
+  bool first_account_added_to_cookie_;
+
   base::WeakPtrFactory<OneClickSigninSyncStarter> weak_pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninSyncStarter);
 };
 
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_STARTER_H_