Removing logic on showing/hiding separator

ash/common/system/tray/tray_background_view.h

Index: ash/common/system/tray/tray_background_view.h
diff --git a/ash/common/system/tray/tray_background_view.h b/ash/common/system/tray/tray_background_view.h
index 57184c6b00019ed6adab97c330503ea376ac6e32..e1743361165297bbefad11bac688c14f6b0ee9a2 100644
--- a/ash/common/system/tray/tray_background_view.h
+++ b/ash/common/system/tray/tray_background_view.h
@@ -129,9 +129,6 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   // ShelfBackgroundAnimatorObserver:
   void UpdateShelfItemBackground(int alpha) override;
 
-  // Updates the visibility of this tray's separator.
-  void SetSeparatorVisibility(bool is_show);
-
   // Gets the anchor for bubbles, which is tray_container().
   views::View* GetBubbleAnchor() const;
 
@@ -184,10 +181,6 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   // in non-MD version and how the ink drop ripples behave in MD version.
   bool is_active_;
 
-  // Visibility of this tray's separator which is a line of 1x32px and 4px to
-  // right of tray.
-  bool is_separator_visible_;
-
   std::unique_ptr<TrayWidgetObserver> widget_observer_;
   std::unique_ptr<TrayEventFilter> tray_event_filter_;