Add rollback support to DeleteRegKeyWorkItem....

chrome/installer/util/work_item_list.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/installer/util/work_item_list.h"
 
 #include "base/logging.h"
 #include "base/file_path.h"
 #include "chrome/installer/util/logging_installer.h"
 #include "chrome/installer/util/copy_tree_work_item.h"
@@ skipping 190 matching lines @@
   if (status_ != ADD_ITEM)
     return false;
 
   bool result = true;
   while (!list_.empty()) {
     WorkItem* work_item = list_.front();
     list_.pop_front();
     executed_list_.push_front(work_item);
     work_item->set_ignore_failure(true);
     if (!work_item->Do()) {
-      LOG(ERROR) << "NoRollbackWorkItemList: item execution failed.";
+      LOG(ERROR) << "NoRollbackWorkItemList: item execution failed "
+                 << work_item->log_message();
       result = false;
     }
   }
 
   if (result)
     VLOG(1) << "NoRollbackWorkItemList: list execution succeeded";
 
   status_ = LIST_EXECUTED;
   return result;
 }
 
 void NoRollbackWorkItemList::Rollback() {
   NOTREACHED() << "Can't rollback a NoRollbackWorkItemList";
 }
-