Re-reland: chromeos: Fix shelf appearing at login screen under mash

ash/common/wm_root_window_controller.h

Index: ash/common/wm_root_window_controller.h
diff --git a/ash/common/wm_root_window_controller.h b/ash/common/wm_root_window_controller.h
index 6ac288a20d1a21b1483625370fe26ceda80de3db..3df79f6bac837e6f0ef7decea5af1b67c6b99f6b 100644
--- a/ash/common/wm_root_window_controller.h
+++ b/ash/common/wm_root_window_controller.h
@@ -97,10 +97,6 @@ class ASH_EXPORT WmRootWindowController {
   // Creates the shelf for this root window and notifies observers.
   void CreateShelf();
 
-  // Show shelf view if it was created hidden (before session has started).
-  // TODO(jamescook): Eliminate this and handle show via Shelf.
-  void ShowShelf();
-
   // Returns the system tray controller. May be null for external displays.
   SystemTray* GetSystemTray();