Clean up some ash constants.

ash/shelf/shelf_constants.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_CONSTANTS_H_
 #define ASH_SHELF_SHELF_CONSTANTS_H_
 
 #include "ash/ash_export.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace ash {
 
-enum ShelfConstant {
-  // Size of the shelf when visible (height when the shelf is horizontal and
-  // width when the shelf is vertical).
-  SHELF_SIZE,
-
-  // Insets allocated for shelf when it is auto hidden.
-  SHELF_INSETS_FOR_AUTO_HIDE
-};
+// Size of the shelf when visible (height when the shelf is horizontal and
+// width when the shelf is vertical).
+ASH_EXPORT constexpr int kShelfSize = 48;
 
 // We reserve a small area on the edge of the workspace area to ensure that
 // the resize handle at the edge of the window can be hit.
 constexpr int kWorkspaceAreaVisibleInset = 2;
 
 // When autohidden we extend the touch hit target onto the screen so that the
 // user can drag the shelf out.
 constexpr int kWorkspaceAreaAutoHideInset = 5;
 
 // Size of the shelf when auto-hidden.
@@ skipping 45 matching lines @@
 
 // The radius of the rounded corners of the overflow button.
 constexpr int kOverflowButtonCornerRadius = 2;
 
 // The radius of the circular material design app list button.
 constexpr int kAppListButtonRadius = kOverflowButtonSize / 2;
 
 // The direction of the focus cycling.
 enum CycleDirection { CYCLE_FORWARD, CYCLE_BACKWARD };
 
-ASH_EXPORT int GetShelfConstant(ShelfConstant shelf_constant);
-
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_CONSTANTS_H_