chromeos: Fix shelf appearing at login screen under mash

ash/common/wm_root_window_controller.cc

Index: ash/common/wm_root_window_controller.cc
diff --git a/ash/common/wm_root_window_controller.cc b/ash/common/wm_root_window_controller.cc
index d4f1be97d9218ac924a4ddc0816d970d8b4a278e..77dc1570bae6fdd94776491d063efc75aecae651 100644
--- a/ash/common/wm_root_window_controller.cc
+++ b/ash/common/wm_root_window_controller.cc
@@ -215,15 +215,6 @@ void WmRootWindowController::CreateShelf() {
   shelf->shelf_widget()->PostCreateShelf();
 }
 
-void WmRootWindowController::ShowShelf() {
-  WmShelf* shelf = GetShelf();
-  if (!shelf->IsShelfInitialized())
-    return;
-  // TODO(jamescook): Move this into WmShelf.
-  shelf->shelf_widget()->SetShelfVisibility(true);
-  shelf->shelf_widget()->status_area_widget()->Show();
-}
-
 SystemTray* WmRootWindowController::GetSystemTray() {
   ShelfWidget* shelf_widget = GetShelf()->shelf_widget();
   if (!shelf_widget || !shelf_widget->status_area_widget())