Moves Shell::ShowShelf() to WmShell

ash/root_window_controller.h

Index: ash/root_window_controller.h
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index 52c246a3a81e8ce609faee62428ffb32ceba1baa..ec746846852ba043c3e1032bc0587eff305085d8 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -143,10 +143,6 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   aura::Window* GetContainer(int container_id);
   const aura::Window* GetContainer(int container_id) const;
 
-  // Show shelf view if it was created hidden (before session has started).
-  // TODO(jamescook): Eliminate this and handle show via Shelf.
-  void ShowShelf();
-
   // Creates the shelf for this root window and notifies observers.
   void CreateShelf();