Make GetCommandExecuteImplClsid return the CLSID as a string directly.

chrome/installer/setup/install_worker.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 contains the definitions of the installer functions that build
 // the WorkItemList used to install the application.
 
 #include "chrome/installer/setup/install_worker.h"
 
 #include <oaidl.h>
@@ skipping 1237 matching lines @@
   DCHECK(set_msi_work_item);
   set_msi_work_item->set_ignore_failure(true);
   set_msi_work_item->set_log_message("Could not write MSI marker!");
 }
 
 void AddDelegateExecuteWorkItems(const InstallerState& installer_state,
                                  const base::FilePath& target_path,
                                  const Version& new_version,
                                  const Product& product,
                                  WorkItemList* list) {
-  base::string16 handler_class_uuid;
   BrowserDistribution* dist = product.distribution();
-  if (!dist->GetCommandExecuteImplClsid(&handler_class_uuid)) {
+  const base::string16 handler_class_uuid = dist->GetCommandExecuteImplClsid();
+  if (handler_class_uuid.empty()) {
     if (InstallUtil::IsChromeSxSProcess()) {
       CleanupBadCanaryDelegateExecuteRegistration(target_path, list);
     } else {
       VLOG(1) << "No DelegateExecute verb handler processing to do for "
               << dist->GetDisplayName();
     }
     return;
   }
 
   HKEY root = installer_state.root_key();
@@ skipping 208 matching lines @@
   // Unconditionally remove the legacy Quick Enable command from the binaries.
   // Do this even if multi-install Chrome isn't installed to ensure that it is
   // not left behind in any case.
   work_item_list->AddDeleteRegKeyWorkItem(
                       installer_state.root_key(), cmd_key, KEY_WOW64_32KEY)
       ->set_log_message("removing " + base::UTF16ToASCII(kCmdQuickEnableCf) +
                         " command");
 }
 
 }  // namespace installer