[Installer] Cleaning up dead code for App Launcher / App Host installs.

chrome/installer/setup/app_launcher_installer.h

Index: chrome/installer/setup/app_launcher_installer.h
diff --git a/chrome/installer/setup/app_launcher_installer.h b/chrome/installer/setup/app_launcher_installer.h
new file mode 100644
index 0000000000000000000000000000000000000000..6ff996b9d2f8b01f11f80b7af354d56ce30c5d7c
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+++ b/chrome/installer/setup/app_launcher_installer.h
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+// Copyright 2015 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.
+
+// The App Launcher is an adjunct product of Google Chrome, but it has a
+// distinct registry entry. The functions in this file tap into various points
+// in installer flow to update the App Launcher's registry, including the
+// removal of deprecated app commands. This concentrates ugly code to to one
+// place to facilitate future refactoring.
+
+#ifndef CHROME_INSTALLER_SETUP_APP_LAUNCHER_INSTALLER_H_
+#define CHROME_INSTALLER_SETUP_APP_LAUNCHER_INSTALLER_H_
+
+#if defined(GOOGLE_CHROME_BUILD)
+
+#include <windows.h>
+
+namespace base {
+class FilePath;
+class Version;
+}  // namespace base
+
+class WorkItemList;
+
+namespace installer {
+
+class InstallerState;
+
+namespace app_launcher_installer {
+
+// Create Version key for a App Launcher (if not already present) and sets the
+// new product version as the last step.  We need this for App Launcher in
+// order for shadow registry key to work.
+void AddAppLauncherVersionKeyWorkItems(
+    HKEY root,
+    const base::Version& new_version,
+    bool add_language_identifier,
+    WorkItemList* list);
+
+// Remove App Launcher's registry key, so it is in sync with Google Chrome's.
+// Note: The key is added by App Launcher in SetDidRunForNDayActiveStats().
+void RemoveAppLauncherVersionKey(HKEY reg_root);
+
+// Adds work item to unconditionally remove legacy executables.
+void AddRemoveLegacyAppHostExeWorkItems(const base::FilePath& target_path,
+                                        const base::FilePath& temp_path,
+                                        WorkItemList* list);
+
+// Adds work item to unconditionally remove legacy app commands like
+// "install-application", "install-extension", and
+// "quick-enable-application-host".
+void AddRemoveLegacyAppCommandsWorkItems(
+    const InstallerState& installer_state,
+    WorkItemList* work_item_list);
+
+}  // namespace app_launcher_installer
+}  // namespace installer
+
+#endif  // defined(GOOGLE_CHROME_BUILD)
+
+#endif  // CHROME_INSTALLER_SETUP_APP_LAUNCHER_INSTALLER_H_