Revert of Windows install_static refactor.

chrome/install_static/chromium_install_modes.h

-// 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.
-
-// Brand-specific types and constants for Chromium.
-
-#ifndef CHROME_INSTALL_STATIC_CHROMIUM_INSTALL_MODES_H_
-#define CHROME_INSTALL_STATIC_CHROMIUM_INSTALL_MODES_H_
-
-namespace install_static {
-
-enum : bool {
-  kUseGoogleUpdateIntegration = false,
-};
-
-enum InstallConstantIndex {
-  CHROMIUM_INDEX,
-  NUM_INSTALL_MODES,
-};
-
-}  // namespace install_static
-
-#endif  // CHROME_INSTALL_STATIC_CHROMIUM_INSTALL_MODES_H_