Remove Shell::shelf()|status_area_widget()|launcher()

ash/system/tray/tray_background_view.h

Index: ash/system/tray/tray_background_view.h
diff --git a/ash/system/tray/tray_background_view.h b/ash/system/tray/tray_background_view.h
index 2d496a55b6e6b45ea817795e4d7d766d8b556ef2..416393ac846d42da068ed2d2f49798faedc18213 100644
--- a/ash/system/tray/tray_background_view.h
+++ b/ash/system/tray/tray_background_view.h
@@ -14,6 +14,7 @@
 namespace ash {
 namespace internal {
 
+class ShelfLayoutManager;
 class StatusAreaWidget;
 class TrayBackground;
 class TrayLayerAnimationObserver;
@@ -130,6 +131,8 @@ class ASH_EXPORT TrayBackgroundView : public internal::ActionableView,
   TrayContainer* tray_container() const { return tray_container_; }
   ShelfAlignment shelf_alignment() const { return shelf_alignment_; }
 
+  ShelfLayoutManager* GetShelfLayoutManager();
+
  private:
   friend class TrayLayerAnimationObserver;