chromeos: Remove references to UnlockScreenFailed signal.

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

 // Copyright (c) 2012 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/chromeos/system/ash_system_tray_delegate.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/audio/audio_observer.h"
 #include "ash/system/bluetooth/bluetooth_observer.h"
@@ skipping 945 matching lines @@
     ash::Shell::GetInstance()->status_area_widget()->
         UpdateAfterLoginStatusChange(GetUserLoginStatus());
   }
 
   virtual void UnlockScreen() OVERRIDE {
     screen_locked_ = false;
     ash::Shell::GetInstance()->status_area_widget()->
         UpdateAfterLoginStatusChange(GetUserLoginStatus());
   }
 
-  virtual void UnlockScreenFailed() OVERRIDE {
-  }
-
   // TODO(sad): Override more from PowerManagerClient::Observer here (e.g.
   // PowerButtonStateChanged etc.).
 
   // Overridden from NetworkMenuIcon::Delegate.
   virtual void NetworkMenuIconChanged() OVERRIDE {
     NotifyRefreshNetwork();
   }
 
   // Overridden from NetworkMenu::Delegate.
   virtual gfx::NativeWindow GetNativeWindow() const OVERRIDE {
@@ skipping 267 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegate);
 };
 
 }  // namespace
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate(ash::SystemTray* tray) {
   return new chromeos::SystemTrayDelegate(tray);
 }
 
 }  // namespace chromeos