Cleanup ash shelf accessor functions.

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 1c32e7ca00a17c2310e58c5da37b9e53b739bce4..3f21f0041cf8aa6d306b4fe814da2dbcbec3e0e9 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -219,10 +219,6 @@ class ASH_EXPORT ShelfLayoutManager
   // available work area from the top of the screen.
   void SetChromeVoxPanelHeight(int height);
 
-  // Returns a ShelfLayoutManager on the display which has a shelf for
-  // given |window|. See RootWindowController::ForShelf for more info.
-  static ShelfLayoutManager* ForShelf(aura::Window* window);
-
  private:
   class AutoHideEventFilter;
   class UpdateShelfObserver;