Remove unused ash::SHELF_ALIGNMENT_TOP

ash/shelf/shelf_layout_manager.h

 // Copyright 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.
 
 #ifndef ASH_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 167 matching lines @@
   // Overridden from ash::LockStateObserver:
   void OnLockStateEvent(LockStateObserver::EventType event) override;
 
   // Overridden from ash::SessionStateObserver:
   void SessionStateChanged(SessionStateDelegate::SessionState state) override;
 
   // TODO(harrym|oshima): These templates will be moved to
   // new Shelf class.
   // A helper function that provides a shortcut for choosing
   // values specific to a shelf alignment.
-  template<typename T>
-  T SelectValueForShelfAlignment(T bottom, T left, T right, T top) const {
+  template <typename T>
+  T SelectValueForShelfAlignment(T bottom, T left, T right) const {
     switch (GetAlignment()) {
       case SHELF_ALIGNMENT_BOTTOM:
         return bottom;
       case SHELF_ALIGNMENT_LEFT:
         return left;
       case SHELF_ALIGNMENT_RIGHT:
         return right;
-      case SHELF_ALIGNMENT_TOP:
-        return top;
     }
     NOTREACHED();
     return right;
   }
 
   template<typename T>
   T PrimaryAxisValue(T horizontal, T vertical) const {
     return IsHorizontalAlignment() ? horizontal : vertical;
   }
 
@@ skipping 197 matching lines @@
 
   // The show hide animation duration override or 0 for default.
   int duration_override_in_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_H_