Remove autocheckout code.

components/autofill/content/browser/autocheckout_page_meta_data.cc

-// Copyright 2013 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 "components/autofill/content/browser/autocheckout_page_meta_data.h"
-
-namespace autofill {
-
-AutocheckoutPageMetaData::AutocheckoutPageMetaData()
-    : current_page_number(-1),
-      total_pages(-1),
-      ignore_ajax(true) {}
-
-AutocheckoutPageMetaData::~AutocheckoutPageMetaData() {}
-
-bool AutocheckoutPageMetaData::IsStartOfAutofillableFlow() const {
-  return current_page_number == 0 && total_pages > 0;
-}
-
-bool AutocheckoutPageMetaData::IsInAutofillableFlow() const {
-  return current_page_number >= 0 && current_page_number < total_pages;
-}
-
-bool AutocheckoutPageMetaData::IsEndOfAutofillableFlow() const {
-  return total_pages > 0 && current_page_number == total_pages - 1;
-}
-
-}  // namesapce autofill