ash: Remove unnecessary utility methods from ash::Shelf

ash/shelf/shelf.h

Index: ash/shelf/shelf.h
diff --git a/ash/shelf/shelf.h b/ash/shelf/shelf.h
index fa7ae733ad73e627df2ae94b6ccfbc93a8b9f272..3975d8eca2817d86b7388a7b118ee012408f5d55 100644
--- a/ash/shelf/shelf.h
+++ b/ash/shelf/shelf.h
@@ -89,15 +89,6 @@ class ASH_EXPORT Shelf {
   // Cycles the window focus linearly over the current shelf items.
   void CycleWindowLinear(CycleDirection direction);
 
-  // Returns true if the shelf is showing a context menu.
-  bool IsShowingMenu() const;
-
-  // TODO(jamescook): Migrate this to ShelfWidget.
-  bool IsShowingOverflowBubble() const;
-
-  // TODO(jamescook): Migrate to ShelfWidget::IsShelfVisible().
-  bool IsVisible() const;
-
   AppListButton* GetAppListButton() const;
 
   // Launch a 0-indexed shelf item in the shelf.