Remove ash tray utility functions that are no-ops in MD.

ash/common/system/chromeos/power/tray_power.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 "ash/common/system/chromeos/power/tray_power.h"
 
 #include <utility>
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/ash_switches.h"
@@ skipping 164 matching lines @@
 views::View* TrayPower::CreateDefaultView(LoginStatus status) {
   // Make sure icon status is up to date. (Also triggers stub activation).
   PowerStatus::Get()->RequestStatusUpdate();
   return NULL;
 }
 
 void TrayPower::DestroyTrayView() {
   power_tray_ = NULL;
 }
 
-void TrayPower::DestroyDefaultView() {}
-
-void TrayPower::UpdateAfterLoginStatusChange(LoginStatus status) {}
-
-void TrayPower::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
-  SetTrayImageItemBorder(power_tray_, alignment);
-}
-
 void TrayPower::OnPowerStatusChanged() {
   bool battery_alert = UpdateNotificationState();
   if (power_tray_)
     power_tray_->UpdateStatus(battery_alert);
 
   // Factory testing may place the battery into unusual states.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           ash::switches::kAshHideNotificationsForFactory))
     return;
 
@@ skipping 151 matching lines @@
   }
   NOTREACHED();
   return false;
 }
 
 void TrayPower::NotifyUsbNotificationClosedByUser() {
   usb_notification_dismissed_ = true;
 }
 
 }  // namespace ash