Fix a few bugs when closing mac notifications

chrome/browser/notifications/platform_notification_service_impl.cc

Index: chrome/browser/notifications/platform_notification_service_impl.cc
diff --git a/chrome/browser/notifications/platform_notification_service_impl.cc b/chrome/browser/notifications/platform_notification_service_impl.cc
index e8a668d30dfa1c77c4041830b5fcf9f3aca3ab3b..255ab55b9a4685b6283cd6235a07c0c94da2a17f 100644
--- a/chrome/browser/notifications/platform_notification_service_impl.cc
+++ b/chrome/browser/notifications/platform_notification_service_impl.cc
@@ -416,15 +416,14 @@ void PlatformNotificationServiceImpl::ClosePersistentNotification(
     // generated by the caller of this method.
     GetNotificationDisplayService(profile)->Close(
         base::Int64ToString(persistent_notification_id));
+  } else {
+    auto iter = persistent_notifications_.find(persistent_notification_id);
+    if (iter == persistent_notifications_.end())
+      return;
+    GetNotificationDisplayService(profile)->Close(iter->second);
   }
 
-  auto iter = persistent_notifications_.find(persistent_notification_id);
-  if (iter == persistent_notifications_.end())
-    return;
-
-  GetNotificationDisplayService(profile)->Close(iter->second);
-
-  persistent_notifications_.erase(iter);
+  persistent_notifications_.erase(persistent_notification_id);
 }
 
 bool PlatformNotificationServiceImpl::GetDisplayedPersistentNotifications(