[WebPayments] Move views-specific code to c/b/ui/views/

chrome/browser/payments/ui/payment_request_dialog.cc

-// Copyright 2016 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 "base/strings/utf_string_conversions.h"
-#include "chrome/browser/payments/ui/payment_request_dialog.h"
-#include "content/public/browser/browser_thread.h"
-#include "ui/views/layout/fill_layout.h"
-
-namespace payments {
-
-PaymentRequestDialog::PaymentRequestDialog(
-    payments::mojom::PaymentRequestClientPtr client)
-    : client_(std::move(client)),
-      label_(new views::Label(base::ASCIIToUTF16("Payments dialog"))) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  SetLayoutManager(new views::FillLayout());
-  AddChildView(label_.get());
-}
-
-PaymentRequestDialog::~PaymentRequestDialog() {}
-
-ui::ModalType PaymentRequestDialog::GetModalType() const {
-  return ui::MODAL_TYPE_CHILD;
-}
-
-gfx::Size PaymentRequestDialog::GetPreferredSize() const {
-  gfx::Size ps = label_->GetPreferredSize();
-  ps.Enlarge(200, 200);
-  return ps;
-}
-
-bool PaymentRequestDialog::Cancel() {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  client_->OnError(payments::mojom::PaymentErrorReason::USER_CANCEL);
-  return true;
-}
-
-}  // namespace payments