Remove last vestigial uses of "update needed" png assets.

chrome/browser/ui/views/critical_notification_bubble_view.cc

Index: chrome/browser/ui/views/critical_notification_bubble_view.cc
diff --git a/chrome/browser/ui/views/critical_notification_bubble_view.cc b/chrome/browser/ui/views/critical_notification_bubble_view.cc
index cbaf22be2807b7af5e7e8e38764b3301e570fadd..2e26666032c85509d0ad4bd93e8ec3160c553ff3 100644
--- a/chrome/browser/ui/views/critical_notification_bubble_view.cc
+++ b/chrome/browser/ui/views/critical_notification_bubble_view.cc
@@ -88,15 +88,6 @@ base::string16 CriticalNotificationBubbleView::GetWindowTitle() const {
                            IDS_CRITICAL_NOTIFICATION_HEADLINE_ALTERNATE);
 }
 
-gfx::ImageSkia CriticalNotificationBubbleView::GetWindowIcon() {
-  return *ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
-      IDR_UPDATE_MENU_SEVERITY_HIGH);
-}
-
-bool CriticalNotificationBubbleView::ShouldShowWindowIcon() const {
-  return true;
-}
-
 void CriticalNotificationBubbleView::WindowClosing() {
   refresh_timer_.Stop();
 }