Only handle the first AccountAddedToCookie event in OneClickSigninSyncStarter

chrome/browser/ui/sync/one_click_signin_sync_starter.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/sync/one_click_signin_sync_starter.h"
 
 #include <stddef.h>
 
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 72 matching lines @@
     const GURL& current_url,
     const GURL& continue_url,
     Callback sync_setup_completed_callback)
     : content::WebContentsObserver(web_contents),
       profile_(NULL),
       start_mode_(start_mode),
       confirmation_required_(confirmation_required),
       current_url_(current_url),
       continue_url_(continue_url),
       sync_setup_completed_callback_(sync_setup_completed_callback),
+      first_account_added_to_cookie_(false),
       weak_pointer_factory_(this) {
   DCHECK(profile);
   DCHECK(web_contents || continue_url.is_empty());
   BrowserList::AddObserver(this);
   Initialize(profile, browser);
 
   // Policy is enabled, so pass in a callback to do extra policy-related UI
   // before signin completes.
   SigninManagerFactory::GetForProfile(profile_)->
       StartSignInWithRefreshToken(
@@ skipping 348 matching lines @@
     return;
   signin_metrics::LogSigninAccessPointCompleted(
       signin::GetAccessPointForPromoURL(current_url_));
   signin_metrics::LogSigninReason(
       signin::GetSigninReasonForPromoURL(current_url_));
   content::RecordAction(base::UserMetricsAction("Signin_Signin_Succeed"));
 }
 
 void OneClickSigninSyncStarter::AccountAddedToCookie(
     const GoogleServiceAuthError& error) {
+  if (first_account_added_to_cookie_)
+    return;
+
+  first_account_added_to_cookie_ = true;
+
   // Regardless of whether the account was successfully added or not,
   // continue with sync starting.
 
   if (switches::UsePasswordSeparatedSigninFlow()) {
     // Under the new signin flow, the sync confirmation dialog should always be
     // shown regardless of |start_mode_|. |sync_setup_completed_callback_| will
     // be run after the modal is closed.
     DisplayModalSyncConfirmationWindow();
     return;
   }
@@ skipping 171 matching lines @@
                                             false /* user_gesture */);
 }
 
 void OneClickSigninSyncStarter::LoadContinueUrl() {
   web_contents()->GetController().LoadURL(
       continue_url_,
       content::Referrer(),
       ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
       std::string());
 }