Remove unused ash::SHELF_ALIGNMENT_TOP

ash/wm/window_animations.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/wm/window_animations.h"
 
 #include <math.h>
 #include <algorithm>
 #include <utility>
 #include <vector>
@@ skipping 461 matching lines @@
       switch (shelf->alignment()) {
         case SHELF_ALIGNMENT_BOTTOM:
           item_rect.set_y(shelf_bounds.y());
           break;
         case SHELF_ALIGNMENT_LEFT:
           item_rect.set_x(shelf_bounds.right());
           break;
         case SHELF_ALIGNMENT_RIGHT:
           item_rect.set_x(shelf_bounds.x());
           break;
-        case SHELF_ALIGNMENT_TOP:
-          item_rect.set_y(shelf_bounds.bottom());
-          break;
       }
       return item_rect;
     }
   }
 
   // Coming here, there is no visible icon of that shelf item and we zoom back
   // to the location of the application launcher (which is fixed as first item
   // of the shelf).
   gfx::Rect work_area =
       gfx::Screen::GetScreen()->GetDisplayNearestWindow(window).work_area();
   int ltr_adjusted_x = base::i18n::IsRTL() ? work_area.right() : work_area.x();
   return shelf->SelectValueForShelfAlignment(
       gfx::Rect(ltr_adjusted_x, work_area.bottom(), 0, 0),
       gfx::Rect(work_area.x(), work_area.y(), 0, 0),
-      gfx::Rect(work_area.right(), work_area.y(), 0, 0),
-      gfx::Rect(ltr_adjusted_x, work_area.y(), 0, 0));
+      gfx::Rect(work_area.right(), work_area.y(), 0, 0));
 }
 
 }  // namespace ash