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

ash/common/system/tray/tray_image_item.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/tray/tray_image_item.h"
 
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_item_view.h"
@@ skipping 22 matching lines @@
 
 views::View* TrayImageItem::CreateTrayView(LoginStatus status) {
   CHECK(!tray_view_);
   tray_view_ = new TrayItemView(this);
   tray_view_->CreateImageView();
   UpdateImageOnImageView();
   tray_view_->SetVisible(GetInitialVisibility());
   return tray_view_;
 }
 
-views::View* TrayImageItem::CreateDefaultView(LoginStatus status) {
-  return nullptr;
-}
-
-views::View* TrayImageItem::CreateDetailedView(LoginStatus status) {
-  return nullptr;
-}
-
-void TrayImageItem::UpdateAfterLoginStatusChange(LoginStatus status) {}
-
-void TrayImageItem::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
-  SetTrayImageItemBorder(tray_view_, alignment);
-}
-
 void TrayImageItem::DestroyTrayView() {
   tray_view_ = nullptr;
 }
 
-void TrayImageItem::DestroyDefaultView() {}
-
-void TrayImageItem::DestroyDetailedView() {}
-
 void TrayImageItem::SetIconColor(SkColor color) {
   icon_color_ = color;
   UpdateImageOnImageView();
 }
 
 void TrayImageItem::UpdateImageOnImageView() {
   if (!tray_view_)
     return;
 
   tray_view_->image_view()->SetImage(
       gfx::CreateVectorIcon(icon_, kTrayIconSize, icon_color_));
 }
 
 }  // namespace ash