Remove unused ash::SHELF_ALIGNMENT_TOP

ash/wm/panels/panel_window_resizer.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/panels/panel_window_resizer.h"
 
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/screen_util.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_types.h"
@@ skipping 142 matching lines @@
           offset->set_x(launcher_bounds.right() - bounds.x());
         }
         break;
       case SHELF_ALIGNMENT_RIGHT:
         if (bounds.right() >= (launcher_bounds.x() -
                                kPanelSnapToLauncherDistance)) {
           should_attach = true;
           offset->set_x(launcher_bounds.x() - bounds.width() - bounds.x());
         }
         break;
-      case SHELF_ALIGNMENT_TOP:
-        if (bounds.y() <= (launcher_bounds.bottom() +
-                           kPanelSnapToLauncherDistance)) {
-          should_attach = true;
-          offset->set_y(launcher_bounds.bottom() - bounds.y());
-        }
-        break;
     }
   }
   return should_attach;
 }
 
 void PanelWindowResizer::StartedDragging() {
   // Tell the panel layout manager that we are dragging this panel before
   // attaching it so that it does not get repositioned.
   if (panel_container_)
     GetPanelLayoutManager(panel_container_)->StartDragging(GetTarget());
@@ skipping 36 matching lines @@
 }
 
 void PanelWindowResizer::UpdateLauncherPosition() {
   if (panel_container_) {
     GetPanelLayoutManager(panel_container_)->shelf()->
         UpdateIconPositionForWindow(GetTarget());
   }
 }
 
 }  // namespace aura