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 102 matching lines @@
          L"Google Chrome App Launcher";
 }
 
 string16 ChromeAppHostDistribution::GetVersionKey() {
   string16 key(google_update::kRegPathClients);
   key.append(L"\\");
   key.append(kChromeAppHostGuid);
   return key;
 }
 
+bool ChromeAppHostDistribution::IsSetAsDefaultSupported() {
+  return false;
+}
+
 bool ChromeAppHostDistribution::CanSetAsDefault() {
   return false;
 }
 
 bool ChromeAppHostDistribution::CanCreateDesktopShortcuts() {
   return true;
 }
 
 string16 ChromeAppHostDistribution::GetIconFilename() {
   return installer::kChromeAppHostExe;
 }
 
+bool ChromeAppHostDistribution::GetCommandExecuteImplClsidString(
+    string16* handler_class_uuid) {
+  return false;
+}
+
 bool ChromeAppHostDistribution::GetCommandExecuteImplClsid(
-    string16* handler_class_uuid) {
+    CLSID* handler_class_uuid) {
   return false;
 }
 
 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
 }