Force COM machinery to notice that the path to the DelegateExecute verb handler has changed.

chrome/installer/util/work_item.cc

Index: chrome/installer/util/work_item.cc
diff --git a/chrome/installer/util/work_item.cc b/chrome/installer/util/work_item.cc
index 8b7bb11f8a24b073f660c7caf551d255f9cc808a..f141384bee482b3ace32c825e6320295ba5c60f4 100644
--- a/chrome/installer/util/work_item.cc
+++ b/chrome/installer/util/work_item.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/installer/util/work_item.h"
 
+#include "chrome/installer/util/callback_work_item.h"
 #include "chrome/installer/util/conditional_work_item_list.h"
 #include "chrome/installer/util/copy_reg_key_work_item.h"
 #include "chrome/installer/util/copy_tree_work_item.h"
@@ -23,6 +24,11 @@ WorkItem::WorkItem() : ignore_failure_(false) {
 WorkItem::~WorkItem() {
 }
 
+CallbackWorkItem* WorkItem::CreateCallbackWorkItem(
+    base::Callback<bool(const CallbackWorkItem&)> callback) {
+  return new CallbackWorkItem(callback);
+}
+
 CopyRegKeyWorkItem* WorkItem::CreateCopyRegKeyWorkItem(
     HKEY predefined_root,
     const std::wstring& source_key_path,