Remove unused ash::SHELF_ALIGNMENT_TOP

ash/system/web_notification/ash_popup_alignment_delegate.cc

 // Copyright 2014 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/web_notification/ash_popup_alignment_delegate.h"
 
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 67 matching lines @@
   // widgets should be at the bottom-left instead of bottom right.
   if (base::i18n::IsRTL())
     return work_area_.x() + kToastMarginX;
 
   if (IsFromLeft())
     return work_area_.x() + kToastMarginX;
   return work_area_.right() - kToastMarginX - toast_bounds.width();
 }
 
 int AshPopupAlignmentDelegate::GetBaseLine() const {
-  return IsTopDown()
-      ? work_area_.y() + kNoToastMarginBorderAndShadowOffset +
-        system_tray_height_
-      : work_area_.bottom() - kNoToastMarginBorderAndShadowOffset -
-        system_tray_height_;
+  return work_area_.bottom() - kNoToastMarginBorderAndShadowOffset -
+         system_tray_height_;
 }
 
 int AshPopupAlignmentDelegate::GetWorkAreaBottom() const {
   return work_area_.bottom() - system_tray_height_;
 }
 
 bool AshPopupAlignmentDelegate::IsTopDown() const {
-  return GetAlignment() == SHELF_ALIGNMENT_TOP;
+  return false;
 }
 
 bool AshPopupAlignmentDelegate::IsFromLeft() const {
   return GetAlignment() == SHELF_ALIGNMENT_LEFT;
 }
 
 void AshPopupAlignmentDelegate::RecomputeAlignment(
     const gfx::Display& display) {
   // Nothing needs to be done.
 }
@@ skipping 35 matching lines @@
 }
 
 void AshPopupAlignmentDelegate::OnDisplayMetricsChanged(
     const gfx::Display& display,
     uint32_t metrics) {
   if (GetCurrentDisplay().id() == display.id())
     UpdateWorkArea();
 }
 
 }  // namespace ash