fix sync login UI on reload

chrome/browser/ui/webui/sync_promo/sync_promo_handler.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/ui/webui/sync_promo/sync_promo_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
@@ skipping 191 matching lines @@
     } else {
       GURL url = SyncPromoUI::GetNextPageURLForSyncPromoURL(sync_url);
       OpenURLParams params(
           url, Referrer(), CURRENT_TAB, content::PAGE_TRANSITION_LINK, false);
       web_ui()->GetWebContents()->OpenURL(params);
     }
   }
 }
 
 void SyncPromoHandler::HandleInitializeSyncPromo(const base::ListValue* args) {
+  // If this is a page reload, then we have to inform the login service
+  // the old UI closed. If this is an initial load, this call will do nothing.
+  GetLoginUIService()->LoginUIClosed(this);
+
   // Open the sync wizard to the login screen.
   OpenSyncSetup(true);
   // We don't need to compute anything for this, just do this every time.
   RecordUserFlowAction(SYNC_PROMO_VIEWED);
   // Increment view count first and show natural numbers in stats rather than 0
   // based starting point (if it happened to be our first time showing this).
   IncrementViewCountBy(1);
   // Record +1 for every view.  This is the only thing we record that's not part
   // of the user flow histogram.
   UMA_HISTOGRAM_COUNTS("SyncPromo.NumTimesViewed", GetViewCount());
@@ skipping 58 matching lines @@
   // Send an enumeration to our single user flow histogram.
   UMA_HISTOGRAM_ENUMERATION("SyncPromo.UserFlow", action,
                             SYNC_PROMO_BUCKET_BOUNDARY);
 }
 
 void SyncPromoHandler::CloseUI() {
   // Callers should not ever try to close the promo UI (should only call
   // CloseUI() if the user is already logged in).
   NOTREACHED() << "Cannot close the promo UI";
 }