Refactor: Shelf Widget

ash/system/status_area_widget.h

Index: ash/system/status_area_widget.h
diff --git a/ash/system/status_area_widget.h b/ash/system/status_area_widget.h
index c83a735b4c1a7c86b74c9a2a365d2a15ecf2c6ec..03a78a41bba7725493ea40027e2a338a3185dfbf 100644
--- a/ash/system/status_area_widget.h
+++ b/ash/system/status_area_widget.h
@@ -6,8 +6,7 @@
 #define ASH_SYSTEM_STATUS_AREA_WIDGET_H_
 
 #include "ash/ash_export.h"
-#include "ash/launcher/background_animator.h"
-#include "ash/shelf_types.h"
+#include "ash/shelf/shelf_types.h"
 #include "ash/system/user/login_status.h"
 #include "ui/views/widget/widget.h"
 
@@ -36,11 +35,6 @@ class ASH_EXPORT StatusAreaWidget : public views::Widget {
   // Update the alignment of the widget and tray views.
   void SetShelfAlignment(ShelfAlignment alignment);
 
-  // Update whether to paint a background for each tray view.
-  void SetPaintsBackground(
-      bool value,
-      internal::BackgroundAnimator::ChangeType change_type);
-
   // Set the visibility state of web notifications.
   void SetHideWebNotifications(bool hide);