Remove non-MD code from ShelfButton

ash/common/shelf/shelf_constants.h

Index: ash/common/shelf/shelf_constants.h
diff --git a/ash/common/shelf/shelf_constants.h b/ash/common/shelf/shelf_constants.h
index e931194d5637b72e54f19a9c8af0637cd51b29aa..f1180aee6d64e86b47db2fb1a5421ecf17d7e1ce 100644
--- a/ash/common/shelf/shelf_constants.h
+++ b/ash/common/shelf/shelf_constants.h
@@ -15,12 +15,6 @@ enum ShelfConstant {
   // width when the shelf is vertical).
   SHELF_SIZE,
 
-  // Size of the space between buttons on the shelf.
-  SHELF_BUTTON_SPACING,
-
-  // Size allocated for each app button on the shelf.
-  SHELF_BUTTON_SIZE,
-
   // Insets allocated for shelf when it is auto hidden.
   SHELF_INSETS_FOR_AUTO_HIDE
 };
@@ -47,6 +41,12 @@ ASH_EXPORT extern const int kTimeToSwitchBackgroundMs;
 // applied based on the desired shelf opacity level.
 ASH_EXPORT extern const SkColor kShelfDefaultBaseColor;
 
+// Size allocated for each app button on the shelf.
+ASH_EXPORT extern const int kShelfButtonSize;
+
+// Size of the space between buttons on the shelf.
+ASH_EXPORT extern const int kShelfButtonSpacing;
+
 // Highlight color used for shelf button activated states.
 // TODO(bruthig|mohsen): Use of this color is temporary. Draw the active state
 // using the material design ripple animation.