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

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"
+#include "chrome/installer/setup/install_worker.h"
+#include "chrome/installer/setup/setup_util.h"
+#include "chrome/installer/util/google_update_constants.h"
+#include "chrome/installer/util/install_util.h"
+#include "chrome/installer/util/installer_state.h"
+#include "chrome/installer/util/l10n_string_util.h"
+#include "chrome/installer/util/product.h"
+#include "chrome/installer/util/updating_app_registration_data.h"
+#include "chrome/installer/util/work_item.h"
+#include "chrome/installer/util/work_item_list.h"
+
+#include "installer_util_strings.h"  // NOLINT
+
+namespace installer {
+
+namespace {
+
+// The legacy command ids for installing an application or extension. These are
+// only here so they can be removed from the registry.
+const wchar_t kLegacyCmdInstallApp[] = L"install-application";
+const wchar_t kLegacyCmdInstallExtension[] = L"install-extension";
+const wchar_t kLegacyCmdQueryEULAAcceptance[] = L"query-eula-acceptance";
+const wchar_t kLegacyCmdQuickEnableApplicationHost[] =
+    L"quick-enable-application-host";
+
+// The legacy app_host.exe executable, which should be eradicated.
+const wchar_t kLegacyChromeAppHostExe[] = L"app_host.exe";
+
+base::string16 GetAppLauncherDisplayName() {
+  return GetLocalizedString(IDS_PRODUCT_APP_LAUNCHER_NAME_BASE);
+}
+
+void AddLegacyAppCommandRemovalItem(const InstallerState& installer_state,
+                                    const AppRegistrationData& reg_data,
+                                    const wchar_t* name,
+                                    WorkItemList* list) {
+  // Ignore failures since this is a clean-up operation and shouldn't block
+  // install or update.
+  list->AddDeleteRegKeyWorkItem(
+                      installer_state.root_key(),
+                      GetRegistrationDataCommandKey(reg_data, name),
+                      KEY_WOW64_32KEY)
+      ->set_ignore_failure(true);
+}
+
+}  // 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) {
+  DCHECK(!InstallUtil::IsChromeSxSProcess());
+  list->AddDeleteTreeWorkItem(
+      target_path.Append(kLegacyChromeAppHostExe),
+      temp_path)->set_ignore_failure(true);
+}
+
+void AddRemoveLegacyAppCommandsWorkItems(const InstallerState& installer_state,
+                                         WorkItemList* list) {
+  DCHECK(!InstallUtil::IsChromeSxSProcess());
+  DCHECK(list);
+  for (const auto* p : installer_state.products()) {
+    if (p->is_chrome()) {
+      // Remove "install-application" command from App Launcher.
+      const UpdatingAppRegistrationData app_launcher_reg_data(kAppLauncherGuid);
+      AddLegacyAppCommandRemovalItem(installer_state, app_launcher_reg_data,
+                                     kLegacyCmdInstallApp, list);
+
+      // Remove "install-extension" command from Chrome.
+      const AppRegistrationData& chrome_reg_data =
+          p->distribution()->GetAppRegistrationData();
+      AddLegacyAppCommandRemovalItem(installer_state, chrome_reg_data,
+                                     kLegacyCmdInstallExtension, list);
+    }
+    if (p->is_chrome_binaries()) {
+      const AppRegistrationData& binaries_reg_data =
+          p->distribution()->GetAppRegistrationData();
+      // Remove "query-eula-acceptance" command from Binaries.
+      AddLegacyAppCommandRemovalItem(installer_state, binaries_reg_data,
+                                     kLegacyCmdQueryEULAAcceptance, list);
+      // Remove "quick-enable-application-host" command from Binaries.
+      AddLegacyAppCommandRemovalItem(installer_state, binaries_reg_data,
+          kLegacyCmdQuickEnableApplicationHost, list);
+    }
+  }
+}
+
+}  // namespace installer
+
+#endif  // GOOGLE_CHROME_BUILD