Remove autocheckout code.

components/autofill/content/browser/autocheckout_steps.h

-// 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.
-
-#ifndef COMPONENTS_AUTOFILL_BROWSER_AUTOCHECKOUT_STEPS_H_
-#define COMPONENTS_AUTOFILL_BROWSER_AUTOCHECKOUT_STEPS_H_
-
-namespace autofill {
-
-// Stages of a buy flow that may be encountered on an Autocheckout-supported
-// site, used primarily for display purposes.
-// Indexed for easy conversion from int values returned by Autofill server.
-enum AutocheckoutStepType {
-  AUTOCHECKOUT_STEP_MIN_VALUE = 1,
-  AUTOCHECKOUT_STEP_SHIPPING = AUTOCHECKOUT_STEP_MIN_VALUE,
-  AUTOCHECKOUT_STEP_DELIVERY = 2,
-  AUTOCHECKOUT_STEP_BILLING = 3,
-  AUTOCHECKOUT_STEP_PROXY_CARD = 4,
-  AUTOCHECKOUT_STEP_MAX_VALUE = AUTOCHECKOUT_STEP_PROXY_CARD,
-};
-
-// Possible statuses for the above step types, again used primarily for display.
-enum AutocheckoutStepStatus {
-  AUTOCHECKOUT_STEP_UNSTARTED,
-  AUTOCHECKOUT_STEP_STARTED,
-  AUTOCHECKOUT_STEP_COMPLETED,
-  AUTOCHECKOUT_STEP_FAILED,
-};
-
-}  // namespace autofill
-
-#endif  // COMPONENTS_AUTOFILL_BROWSER_AUTOCHECKOUT_STEPS_H_