Remove NoNotificationMessageView from empty message center

ui/message_center/views/message_center_button_bar.cc

Index: ui/message_center/views/message_center_button_bar.cc
diff --git a/ui/message_center/views/message_center_button_bar.cc b/ui/message_center/views/message_center_button_bar.cc
index 47613da4f3167ddb158b6d6aa50957e1b4df972f..305aa04811c643f43e2219659c5ba656701ab9f7 100644
--- a/ui/message_center/views/message_center_button_bar.cc
+++ b/ui/message_center/views/message_center_button_bar.cc
@@ -255,9 +255,8 @@ void MessageCenterButtonBar::ViewVisibilityChanged() {
 
 MessageCenterButtonBar::~MessageCenterButtonBar() {}
 
-void MessageCenterButtonBar::SetAllButtonsEnabled(bool enabled) {
-  if (close_all_button_)
-    close_all_button_->SetEnabled(enabled);
+void MessageCenterButtonBar::SetSettingsAndQuietModeButtonsEnabled(
+    bool enabled) {
   settings_button_->SetEnabled(enabled);
   quiet_mode_button_->SetEnabled(enabled);
 }