Do not update arrow when use-alternate-shelf

ash/system/tray/tray_background_view.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/system/tray/tray_background_view.h"
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 563 matching lines @@
     background_->set_color(kTrayBackgroundPressedColor);
   else if (hovered_)
     background_->set_alpha(kTrayBackgroundHoverAlpha);
   else
     background_->set_alpha(kTrayBackgroundAlpha);
   SchedulePaint();
 }
 
 void TrayBackgroundView::UpdateBubbleViewArrow(
     views::TrayBubbleView* bubble_view) {
+  if (switches::UseAlternateShelfLayout())
+    return;
+
   aura::RootWindow* root_window =
       bubble_view->GetWidget()->GetNativeView()->GetRootWindow();
   ash::internal::ShelfLayoutManager* shelf =
       ShelfLayoutManager::ForLauncher(root_window);
   bubble_view->SetArrowPaintType(
       shelf->IsVisible() ? views::BubbleBorder::PAINT_NORMAL :
                            views::BubbleBorder::PAINT_TRANSPARENT);
 }
 
 }  // namespace internal
 }  // namespace ash