Don't register or use the DelegateExecute verb handler if it isn't present.

chrome/installer/util/google_chrome_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 specific implementation of BrowserDistribution class for
 // Google Chrome.
 
 #include "chrome/installer/util/google_chrome_distribution.h"
 
 #include <windows.h>
@@ skipping 520 matching lines @@
   key.append(L"\\");
   key.append(product_guid());
   return key;
 }
 
 bool GoogleChromeDistribution::GetDelegateExecuteHandlerData(
     string16* handler_class_uuid,
     string16* type_lib_uuid,
     string16* type_lib_version,
     string16* interface_uuid) {
-  if (handler_class_uuid)
-    *handler_class_uuid = kCommandExecuteImplUuid;
-  if (type_lib_uuid)
-    *type_lib_uuid = kDelegateExecuteLibUuid;
-  if (type_lib_version)
-    *type_lib_version = kDelegateExecuteLibVersion;
-  if (interface_uuid)
-    *interface_uuid = kICommandExecuteImplUuid;
-  return true;
+  // Chrome's DelegateExecute verb handler is only used for Windows 8 and up.
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
+    if (handler_class_uuid)
+      *handler_class_uuid = kCommandExecuteImplUuid;
+    if (type_lib_uuid)
+      *type_lib_uuid = kDelegateExecuteLibUuid;
+    if (type_lib_version)
+      *type_lib_version = kDelegateExecuteLibVersion;
+    if (interface_uuid)
+      *interface_uuid = kICommandExecuteImplUuid;
+    return true;
+  }
+  return false;
 }
 
 // This method checks if we need to change "ap" key in Google Update to try
 // full installer as fall back method in case incremental installer fails.
 // - If incremental installer fails we append a magic string ("-full"), if
 // it is not present already, so that Google Update server next time will send
 // full installer to update Chrome on the local machine
 // - If we are currently running full installer, we remove this magic
 // string (if it is present) regardless of whether installer failed or not.
 // There is no fall-back for full installer :)
@@ skipping 282 matching lines @@
   // we waited for chrome to exit so the uninstall would not detect chrome
   // running.
   bool system_level_toast = CommandLine::ForCurrentProcess()->HasSwitch(
       installer::switches::kSystemLevelToast);
 
   CommandLine cmd(InstallUtil::GetChromeUninstallCmd(system_level_toast,
                                                      GetType()));
   base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
 }
 #endif