Revert 285661 "Remove some dead app host code."

trunk/src/chrome/installer/setup/setup_constants.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/installer/setup/setup_constants.h"
 
 namespace installer {
 
 // Elements that make up install paths.
 const wchar_t kChromeArchive[] = L"chrome.7z";
 const wchar_t kChromeCompressedArchive[] = L"chrome.packed.7z";
 const wchar_t kVisualElements[] = L"VisualElements";
 const wchar_t kVisualElementsManifest[] = L"VisualElementsManifest.xml";
 const wchar_t kWowHelperExe[] = L"wow_helper.exe";
 
 // Sub directory of install source package under install temporary directory.
 const wchar_t kInstallSourceDir[] = L"source";
 const wchar_t kInstallSourceChromeDir[] = L"Chrome-bin";
 
 const wchar_t kMediaPlayerRegPath[] =
     L"Software\\Microsoft\\MediaPlayer\\ShimInclusionList";
 
+// Key names for values passed via the GoogleUpdateUntrustedData environment
+// variable.
+const char kInstallFromWebstore[] = "install-from-webstore";
+
 }  // namespace installer