Remove the most obvious dead code from message center.

chrome/browser/ui/cocoa/notifications/message_center_tray_bridge.mm

 // Copyright (c) 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/cocoa/notifications/message_center_tray_bridge.h"
 
 #include "base/bind.h"
 #include "base/i18n/number_formatting.h"
 #include "base/message_loop.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 39 matching lines @@
 bool MessageCenterTrayBridge::ShowPopups() {
   popup_collection_.reset(
       [[MCPopupCollection alloc] initWithMessageCenter:message_center_]);
   return true;
 }
 
 void MessageCenterTrayBridge::HidePopups() {
   popup_collection_.reset();
 }
 
-void MessageCenterTrayBridge::UpdatePopups() {
-  // Nothing to do since the popup collection observes the MessageCenter
-  // directly.
-}
-
 bool MessageCenterTrayBridge::ShowMessageCenter() {
   if (tray_controller_)
     return false;
 
   // Post a task to open the window, because in
   // MessageCenterTray::ShowMessageCenterBubble, the unread count gets set to
   // 0 after it calls this delegate. In order show the window at the correct
   // position after the unread count is updated, opening the window must be
   // performed after the return of this method.
   base::MessageLoop::current()->PostTask(FROM_HERE,
@@ skipping 49 matching lines @@
 
   UpdateStatusItem();
 
   [status_item_view_ setHighlight:YES];
   NSRect frame = [[status_item_view_ window] frame];
   [tray_controller_ showTrayAtRightOf:NSMakePoint(NSMinX(frame),
                                                   NSMinY(frame))
                              atLeftOf:NSMakePoint(NSMaxX(frame),
                                                   NSMinY(frame))];
 }