Fix flashing window when deleting profile

chrome/browser/ui/webui/sync_promo/sync_promo_handler.cc

 // Copyright (c) 2011 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 182 matching lines @@
 
 void SyncPromoHandler::HandleCloseSyncPromo(const base::ListValue* args) {
   CloseSyncSetup();
 
   // If the user has signed in then set the pref to show them NTP bubble
   // confirming that they're signed in.
   std::string username = prefs_->GetString(prefs::kGoogleServicesUsername);
   if (!username.empty())
     prefs_->SetBoolean(prefs::kSyncPromoShowNTPBubble, true);
 
-  GURL url = SyncPromoUI::GetNextPageURLForSyncPromoURL(
-      web_ui()->GetWebContents()->GetURL());
-  OpenURLParams params(
-      url, Referrer(), CURRENT_TAB, content::PAGE_TRANSITION_LINK, false);
-  web_ui()->GetWebContents()->OpenURL(params);
+  // If the browser window is being closed then don't try to navigate to
+  // another URL. This prevents the browser window from flashing during
+  // close.
+  Browser* browser =
+      BrowserList::FindBrowserWithWebContents(web_ui()->GetWebContents());
+  if (browser && !browser->IsAttemptingToCloseBrowser()) {
+    GURL url = SyncPromoUI::GetNextPageURLForSyncPromoURL(
+        web_ui()->GetWebContents()->GetURL());
+    OpenURLParams params(
+        url, Referrer(), CURRENT_TAB, content::PAGE_TRANSITION_LINK, false);
+    web_ui()->GetWebContents()->OpenURL(params);
+  }
 }
 
 void SyncPromoHandler::HandleInitializeSyncPromo(const base::ListValue* args) {
   // If the promo is also the Chrome launch page, we want to show the title and
   // log an event if we are running an experiment.
   bool is_launch_page = SyncPromoUI::GetIsLaunchPageForSyncPromoURL(
       web_ui()->GetWebContents()->GetURL());
   if (is_launch_page && sync_promo_trial::IsExperimentActive())
     sync_promo_trial::RecordUserSawMessage();
   base::FundamentalValue visible(is_launch_page);
@@ skipping 75 matching lines @@
     Profile* profile = Profile::FromWebUI(web_ui());
     sync_promo_trial::RecordUserSignedInWithTrialBrand(is_start_up, profile);
   }
 }
 
 void SyncPromoHandler::RecordUserFlowAction(int action) {
   // Send an enumeration to our single user flow histogram.
   UMA_HISTOGRAM_ENUMERATION("SyncPromo.UserFlow", action,
                             SYNC_PROMO_BUCKET_BOUNDARY);
 }