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

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index 2eb1dbf9a19d0cec6107e811d17d113efe3acfe2..78b101441c362e1800a1565b99474d7a32501ee9 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -371,14 +371,6 @@ void RootWindowController::CreateShelf() {
   wm_shelf_->shelf_widget()->PostCreateShelf();
 }
 
-void RootWindowController::ShowShelf() {
-  if (!wm_shelf_->IsShelfInitialized())
-    return;
-  // TODO(jamescook): Move this into WmShelf.
-  wm_shelf_->shelf_widget()->SetShelfVisibility(true);
-  wm_shelf_->shelf_widget()->status_area_widget()->Show();
-}
-
 ShelfLayoutManager* RootWindowController::GetShelfLayoutManager() {
   return wm_shelf_->shelf_layout_manager();
 }