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

chrome/installer/util/app_launcher_installer_util.cc

+// Copyright (c) 2014 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 "base/strings/string_util.h"
+#include "chrome/installer/util/app_launcher_installer_util.h"
+
+namespace installer {
+namespace app_launcher_installer {
+
+namespace {
+
+const wchar_t kModSeparator[] = L"-";
+const wchar_t kModAppHostWithSeparator[] = L"-apphost-";
+const wchar_t kModAppLauncherWithSeparator[] = L"-applauncher-";
+
+}  // namespace
+
+// To remove "-test" from "-abc-test-efg", we:
+// (1) add sentinel "-" to the end to form "-abc-test-efg-",
+// (2) search for "-test" + "-" = "-test-",
+// (3) if found, replace substring with "-" to get "-abc-efg-",
+// (4) remove trialing "-" to get "-abc-efg".
+void RemoveDeprecatedModifiers(base::string16* value) {
+  value->push_back(kModSeparator[0]);  // Add sentinel.
+  ReplaceFirstSubstringAfterOffset(
+      value, 0, kModAppHostWithSeparator, kModSeparator);
+  ReplaceFirstSubstringAfterOffset(
+      value, 0, kModAppLauncherWithSeparator, kModSeparator);
+  value->pop_back();  // Remove sentinel.
+}
+
+}  // namespace app_launcher_installer
+}  // namespace installer
+
+#endif  // defined(GOOGLE_CHROME_BUILD)