[Web Payments] Add Cancel button to all sheets

chrome/browser/ui/views/payments/shipping_list_view_controller.cc

 // Copyright 2017 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/payments/shipping_list_view_controller.h"
 
 #include <memory>
 #include <utility>
 
 #include "chrome/browser/ui/views/payments/payment_request_dialog_view.h"
@@ skipping 31 matching lines @@
   }
 
   return CreatePaymentView(
       CreateSheetHeaderView(
           /* show_back_arrow = */ true,
           l10n_util::GetStringUTF16(IDS_PAYMENT_REQUEST_SHIPPING_SECTION_NAME),
           this),
       std::move(content_view));
 }
 
-void ShippingListViewController::ButtonPressed(views::Button* sender,
-                                               const ui::Event& event) {
-  switch (sender->tag()) {
-    case static_cast<int>(PaymentRequestCommonTags::CLOSE_BUTTON_TAG):
-      dialog()->CloseDialog();
-      break;
-    case static_cast<int>(PaymentRequestCommonTags::BACK_BUTTON_TAG):
-      dialog()->GoBack();
-      break;
-    default:
-      NOTREACHED();
-  }
-}
-
 }  // namespace payments