Fix a crash after removing button from site settings popup

chrome/browser/ui/views/page_info/chosen_object_row.cc

 // Copyright 2015 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 "chrome/browser/ui/views/page_info/chosen_object_row.h"
 
 #include "chrome/browser/ui/views/page_info/chosen_object_row_observer.h"
 #include "chrome/browser/ui/views/page_info/page_info_popup_view.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 54 matching lines @@
 }
 
 ChosenObjectRow::~ChosenObjectRow() {}
 
 void ChosenObjectRow::ButtonPressed(views::Button* sender,
                                     const ui::Event& event) {
   // Change the icon to reflect the selected setting.
   const gfx::Image& image = PageInfoUI::GetChosenObjectIcon(*info_, true);
   icon_->SetImage(image.ToImageSkia());
 
-  RemoveChildView(delete_button_);
-  delete delete_button_;
-  delete_button_ = nullptr;
+  DCHECK(delete_button_->visible());
+  delete_button_->SetVisible(false);
 
   for (ChosenObjectRowObserver& observer : observer_list_)
     observer.OnChosenObjectDeleted(*info_);
 }