(re-commit) Implement installation of the Chrome App Host.

chrome/installer/mini_installer/appid.h

Index: chrome/installer/mini_installer/appid.h
diff --git a/chrome/installer/mini_installer/appid.h b/chrome/installer/mini_installer/appid.h
index 7dcd4e0be66ecdbee3dd3682f33825635df1ef61..1ea93a4bd3f3cae770b382b92f6223993a91faa0 100644
--- a/chrome/installer/mini_installer/appid.h
+++ b/chrome/installer/mini_installer/appid.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -9,6 +9,7 @@
 namespace google_update {
 extern const wchar_t kAppGuid[];
 extern const wchar_t kSxSAppGuid[];
+extern const wchar_t kChromeAppHostAppGuid[];
 extern const wchar_t kChromeFrameAppGuid[];
 extern const wchar_t kMultiInstallAppGuid[];
 }