Revert "chromeos: Fix shelf appearing at login screen under mash"

ash/common/shelf/shelf_widget.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/shelf/shelf_widget.h"
 
 #include "ash/common/focus_cycler.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/shelf/app_list_button.h"
@@ skipping 313 matching lines @@
   GetContentsView()->AddChildView(shelf_view_);
   return shelf_view_;
 }
 
 void ShelfWidget::PostCreateShelf() {
   SetFocusCycler(WmShell::Get()->focus_cycler());
 
   // Ensure the newly created |shelf_| gets current values.
   background_animator_.Initialize(this);
 
-  // TODO(jamescook): The IsActiveUserSessionStarted() check may not be needed
-  // because the shelf is only created after the first user session is active.
-  // The ShelfView seems to always be visible after login. At the lock screen
-  // the shelf is hidden because its container is hidden. During auto-hide it is
-  // hidden because ShelfWidget is transparent. Some of the ShelfView visibility
-  // code could be simplified. http://crbug.com/674773
   shelf_view_->SetVisible(
       WmShell::Get()->GetSessionStateDelegate()->IsActiveUserSessionStarted());
   shelf_layout_manager_->LayoutShelf();
   shelf_layout_manager_->UpdateAutoHideState();
   Show();
 }
 
 bool ShelfWidget::IsShelfVisible() const {
   return shelf_view_ && shelf_view_->visible();
 }
 
+void ShelfWidget::SetShelfVisibility(bool visible) {
+  if (shelf_view_)
+    shelf_view_->SetVisible(visible);
+}
+
 bool ShelfWidget::IsShowingAppList() const {
   return GetAppListButton() && GetAppListButton()->is_showing_app_list();
 }
 
 bool ShelfWidget::IsShowingContextMenu() const {
   return shelf_view_ && shelf_view_->IsShowingMenu();
 }
 
 bool ShelfWidget::IsShowingOverflowBubble() const {
   return shelf_view_ && shelf_view_->IsShowingOverflowBubble();
@@ skipping 67 matching lines @@
   if (shelf_view_)
     shelf_view_->UpdateShelfItemBackground(alpha);
 }
 
 void ShelfWidget::WillDeleteShelfLayoutManager() {
   shelf_layout_manager_->RemoveObserver(this);
   shelf_layout_manager_ = nullptr;
 }
 
 }  // namespace ash