Remove non-MD code from StatusAreaWidgetDelegate

ash/common/system/tray/tray_constants.h

Index: ash/common/system/tray/tray_constants.h
diff --git a/ash/common/system/tray/tray_constants.h b/ash/common/system/tray/tray_constants.h
index e457f1dfd1ab1b17558e13fc4dac8b7a6c7f3213..ab4881793032d348181334310a29fdc95577ec36 100644
--- a/ash/common/system/tray/tray_constants.h
+++ b/ash/common/system/tray/tray_constants.h
@@ -138,14 +138,10 @@ extern const int kTrayPopupInkDropCornerRadius;
 // The height of the system info row.
 extern const int kTrayPopupSystemInfoRowHeight;
 
-enum TrayConstant {
-  // A legacy height value used in non-MD calculations for applying additional
-  // borders on tray items.
-  TRAY_ITEM_HEIGHT_LEGACY,
-
-  // Padding between the edge of shelf and the item in status tray area.
-  TRAY_PADDING_FROM_EDGE_OF_SHELF,
+// Padding between the edge of shelf and the item in status tray area.
+extern const int kTrayPaddingFromEdgeOfShelf;
 
+enum TrayConstant {
   // The minimum height of the rows in the system tray menu.
   TRAY_POPUP_ITEM_MIN_HEIGHT,