ash: Remove unnecessary utility methods from ash::Shelf

ash/shelf/shelf_widget.h

Index: ash/shelf/shelf_widget.h
diff --git a/ash/shelf/shelf_widget.h b/ash/shelf/shelf_widget.h
index caea889ca56596e66bbc0f5665389c7739013807..bbf8f203691e341b05cf5c7063939016ee468a3b 100644
--- a/ash/shelf/shelf_widget.h
+++ b/ash/shelf/shelf_widget.h
@@ -72,6 +72,10 @@ class ASH_EXPORT ShelfWidget : public views::Widget,
   void SetShelfVisibility(bool visible);
   bool IsShelfVisible() const;
 
+  bool IsShowingContextMenu() const;
+
+  bool IsShowingOverflowBubble() const;
+
   // Sets the focus cycler.  Also adds the shelf to the cycle.
   void SetFocusCycler(FocusCycler* focus_cycler);
   FocusCycler* GetFocusCycler();