Remove the most obvious dead code from message center.

chrome/browser/ui/views/message_center/web_notification_tray.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 "chrome/browser/ui/views/message_center/web_notification_tray.h"
 
 #include "base/i18n/number_formatting.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 180 matching lines @@
 }
 
 bool WebNotificationTray::ShowMessageCenter() {
   return ShowMessageCenterInternal(false /* show_settings */);
 }
 
 void WebNotificationTray::HideMessageCenter() {
   message_center_bubble_.reset();
 }
 
-void WebNotificationTray::UpdatePopups() {
-  // |popup_collection_| receives notification add/remove events and updates
-  // itself, so this method doesn't need to do anything.
-  // TODO(mukai): remove this method (currently this is used by
-  // non-rich-notifications in ChromeOS).
-};
-
 bool WebNotificationTray::ShowNotifierSettings() {
   if (message_center_bubble_) {
     static_cast<MessageCenterBubble*>(
         message_center_bubble_->bubble())->SetSettingsVisible();
     return true;
   }
   return ShowMessageCenterInternal(true /* show_settings */);
 }
 
 void WebNotificationTray::OnMessageCenterTrayChanged() {
@@ skipping 116 matching lines @@
 
 message_center::MessageCenterBubble*
 WebNotificationTray::GetMessageCenterBubbleForTest() {
   if (!message_center_bubble_.get())
     return NULL;
   return static_cast<message_center::MessageCenterBubble*>(
       message_center_bubble_->bubble());
 }
 
 }  // namespace message_center