Windows install_static refactor.

chrome/install_static/google_chrome_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 Google Chrome.
+
+#ifndef CHROME_INSTALL_STATIC_GOOGLE_CHROME_INSTALL_MODES_H_
+#define CHROME_INSTALL_STATIC_GOOGLE_CHROME_INSTALL_MODES_H_
+
+namespace install_static {
+
+enum : bool {
+  kUseGoogleUpdateIntegration = true,
+};
+
+enum InstallConstantIndex {
+  STABLE_INDEX,

[robertshield, 2016/10/24 14:59:26]

Do you plan to include Beta and Dev in here in the future? If so, maybe set the
numeric values of these indices to 0 and 3 respectively leaving room for the
other two?

[grt (UTC plus 2), 2016/10/24 19:36:00]

Yessir!
The numeric values don't have any meaning beyond a single run at the moment, so
I don't see a need to reserve values 1 and 2. If I find a reason to send the
index via UMA or something, I will do as you propose.

[robertshield, 2016/10/28 06:56:52]

Okey dokey.

+  CANARY_INDEX,
+  NUM_INSTALL_MODES,
+};
+
+}  // namespace install_static
+
+#endif  // CHROME_INSTALL_STATIC_GOOGLE_CHROME_INSTALL_MODES_H_