Fix flashing window when deleting profile

chrome/browser/ui/webui/sync_promo/sync_promo_handler2.cc

Index: chrome/browser/ui/webui/sync_promo/sync_promo_handler2.cc
diff --git a/chrome/browser/ui/webui/sync_promo/sync_promo_handler2.cc b/chrome/browser/ui/webui/sync_promo/sync_promo_handler2.cc
index cabbfc83dc80477dbccda41bc48cc5f67ea71538..431e24d58d2a8d645238b4d000f8315804db7c84 100644
--- a/chrome/browser/ui/webui/sync_promo/sync_promo_handler2.cc
+++ b/chrome/browser/ui/webui/sync_promo/sync_promo_handler2.cc
@@ -204,10 +204,17 @@ void SyncPromoHandler2::HandleCloseSyncPromo(const base::ListValue* args) {
   if (!username.empty())
     prefs_->SetBoolean(prefs::kSyncPromoShowNTPBubble, true);
 
-  GURL url = SyncPromoUI::GetNextPageURLForSyncPromoURL(
-      web_ui_->tab_contents()->GetURL());
-  web_ui_->tab_contents()->OpenURL(url, GURL(), CURRENT_TAB,
-                                   content::PAGE_TRANSITION_LINK);
+  // 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_->tab_contents()->GetURL());
+    web_ui_->tab_contents()->OpenURL(url, GURL(), CURRENT_TAB,
+                                     content::PAGE_TRANSITION_LINK);
+  }
 }
 
 void SyncPromoHandler2::HandleInitializeSyncPromo(const base::ListValue* args) {