Remove NoNotificationMessageView from empty message center

ui/message_center/views/message_center_button_bar.cc

 // Copyright 2013 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 "ui/message_center/views/message_center_button_bar.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 237 matching lines @@
     layout->AddView(title_arrow_);
   layout->AddView(notification_label_);
   layout->AddView(button_container_);
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   layout->AddView(close_bubble_button_);
 #endif
 }
 
 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);
 }
 
 void MessageCenterButtonBar::SetCloseAllButtonEnabled(bool enabled) {
   if (close_all_button_)
     close_all_button_->SetEnabled(enabled);
 }
 
 views::Button* MessageCenterButtonBar::GetCloseAllButtonForTest() const {
@@ skipping 31 matching lines @@
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   } else if (sender == close_bubble_button_) {
     message_center_view()->tray()->HideMessageCenterBubble();
 #endif
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace message_center