Purge the App Launcher code from Windows.

chrome/installer/setup/app_launcher_installer.cc

 // 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.
 
 #if defined(GOOGLE_CHROME_BUILD)
 
 #include "chrome/installer/setup/app_launcher_installer.h"
 
 #include "base/strings/string16.h"
 #include "base/version.h"
@@ skipping 36 matching lines @@
   // install or update.
   auto* delete_reg_key_work_item = list->AddDeleteRegKeyWorkItem(
       installer_state.root_key(), GetRegistrationDataCommandKey(reg_data, name),
       KEY_WOW64_32KEY);
   delete_reg_key_work_item->set_best_effort(true);
   delete_reg_key_work_item->set_rollback_enabled(false);
 }
 
 }  // namespace
 
-void AddAppLauncherVersionKeyWorkItems(HKEY root,
-                                       const base::Version& new_version,
-                                       bool add_language_identifier,
-                                       WorkItemList* list) {
-  DCHECK(!InstallUtil::IsChromeSxSProcess());
-  const UpdatingAppRegistrationData app_launcher_reg_data(kAppLauncherGuid);
-  AddVersionKeyWorkItems(root,
-                         app_launcher_reg_data.GetVersionKey(),
-                         GetAppLauncherDisplayName(),
-                         new_version,
-                         add_language_identifier,
-                         list);
-}
-
 void RemoveAppLauncherVersionKey(HKEY reg_root) {
   DCHECK(!InstallUtil::IsChromeSxSProcess());
   const UpdatingAppRegistrationData app_launcher_reg_data(kAppLauncherGuid);
   InstallUtil::DeleteRegistryKey(
       reg_root, app_launcher_reg_data.GetVersionKey(), KEY_WOW64_32KEY);
 }
 
 void AddRemoveLegacyAppHostExeWorkItems(const base::FilePath& target_path,
                                         const base::FilePath& temp_path,
                                         WorkItemList* list) {
@@ skipping 30 matching lines @@
       // Remove "quick-enable-application-host" command from Binaries.
       AddLegacyAppCommandRemovalItem(installer_state, binaries_reg_data,
           kLegacyCmdQuickEnableApplicationHost, list);
     }
   }
 }
 
 }  // namespace installer
 
 #endif  // GOOGLE_CHROME_BUILD