Remove unused ash::SHELF_ALIGNMENT_TOP

ash/shelf/shelf.h

 // Copyright 2013 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_H_
 #define ASH_SHELF_SHELF_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_types.h"
@@ skipping 48 matching lines @@
   void SetAlignment(ShelfAlignment alignment);
   ShelfAlignment alignment() const { return alignment_; }
   bool IsHorizontalAlignment() const;
 
   // Sets the ShelfAutoHideBehavior. See enum description for details.
   void SetAutoHideBehavior(ShelfAutoHideBehavior behavior);
   ShelfAutoHideBehavior GetAutoHideBehavior() const;
 
   // A helper functions that chooses values specific to a shelf alignment.
   template <typename T>
-  T SelectValueForShelfAlignment(T bottom, T left, T right, T top) const {
+  T SelectValueForShelfAlignment(T bottom, T left, T right) const {
     switch (alignment_) {
       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;
   }
 
   // A helper functions that chooses values specific to a shelf alignment type.
   template <typename T>
   T PrimaryAxisValue(T horizontal, T vertical) const {
     return IsHorizontalAlignment() ? horizontal : vertical;
   }
@@ skipping 57 matching lines @@
   ShelfDelegate* delegate_;
 
   ShelfWidget* shelf_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(Shelf);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_H_