Only do DelegateExecute verb handler registration for Google Chrome.

chrome/installer/util/browser_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 class that contains various method related to branding.
 // It provides only default implementations of these methods. Usually to add
 // specific branding, we will need to extend this class with a custom
 // implementation.
 
 #include "chrome/installer/util/browser_distribution.h"
@@ skipping 211 matching lines @@
 }
 
 int BrowserDistribution::GetIconIndex() {
   return 0;
 }
 
 bool BrowserDistribution::GetChromeChannel(std::wstring* channel) {
   return false;
 }
 
+bool BrowserDistribution::GetDelegateExecuteHandlerData(
+    string16* handler_class_uuid,
+    string16* type_lib_uuid,
+    string16* type_lib_version,
+    string16* interface_uuid) {
+  // TODO(grt): http://crbug.com/123727 Return values for Chromium.
+  return false;
+}
+
 void BrowserDistribution::UpdateInstallStatus(bool system_install,
     installer::ArchiveType archive_type,
     installer::InstallStatus install_status) {
 }
 
 bool BrowserDistribution::GetExperimentDetails(
     UserExperiment* experiment, int flavor) {
   return false;
 }
 
 void BrowserDistribution::LaunchUserExperiment(
     const FilePath& setup_path, installer::InstallStatus status,
     const Version& version, const installer::Product& product,
     bool system_level) {
 }
 
 
 void BrowserDistribution::InactiveUserToastExperiment(int flavor,
     const std::wstring& experiment_group,
     const installer::Product& installation,
     const FilePath& application_path) {
 }