Give SxS distribution its own registration GUIDs.

chrome/installer/util/chrome_app_host_distribution.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.
 //
 // This file defines a specific implementation of BrowserDistribution class for
 // Chrome App Host. It overrides the bare minimum of methods necessary to get a
 // Chrome App Host installer that does not interact with Google Chrome or
 // Chromium installations.
 
 #include "chrome/installer/util/chrome_app_host_distribution.h"
@@ skipping 20 matching lines @@
 }
 
 string16 ChromeAppHostDistribution::GetAppGuid() {
   return kChromeAppHostGuid;
 }
 
 string16 ChromeAppHostDistribution::GetBaseAppName() {
   return L"Google Chrome App Launcher";
 }
 
+string16 ChromeAppHostDistribution::GetBrowserProgIdPrefix() {
+  NOTREACHED();
+  return string16();
+}
+
+string16 ChromeAppHostDistribution::GetBrowserProgIdDesc() {
+  NOTREACHED();
+  return string16();
+}
+
 string16 ChromeAppHostDistribution::GetDisplayName() {
   return GetShortcutName(SHORTCUT_APP_LAUNCHER);
 }
 
 string16 ChromeAppHostDistribution::GetShortcutName(
     ShortcutType shortcut_type) {
   DCHECK_EQ(shortcut_type, SHORTCUT_APP_LAUNCHER);
   return installer::GetLocalizedString(IDS_PRODUCT_APP_LAUNCHER_NAME_BASE);
 }
 
@@ skipping 88 matching lines @@
 
 void ChromeAppHostDistribution::UpdateInstallStatus(bool system_install,
     installer::ArchiveType archive_type,
     installer::InstallStatus install_status) {
 #if defined(GOOGLE_CHROME_BUILD)
   GoogleUpdateSettings::UpdateInstallStatus(system_install,
       archive_type, InstallUtil::GetInstallReturnCode(install_status),
       kChromeAppHostGuid);
 #endif
 }