Revert of Add best-effort/allow rollback flags on WorkItem.

chrome/installer/setup/install_worker.h

Index: chrome/installer/setup/install_worker.h
diff --git a/chrome/installer/setup/install_worker.h b/chrome/installer/setup/install_worker.h
index 11d7e116f00b0e80cf23a1bf31c15b609b10c716..a2fc7f3b9318865ee5a86cc1d8ee72c71a193fdb 100644
--- a/chrome/installer/setup/install_worker.h
+++ b/chrome/installer/setup/install_worker.h
@@ -119,13 +119,14 @@
 // |system_level| specifies whether to call the system or user level DLL
 // registration entry points.
 // |do_register| says whether to register or unregister.
-// If |best_effort| is true, registration or unregistration failure doesn't
-// cause failure of |work_item_list|.
+// |may_fail| states whether this is best effort or not. If |may_fail| is true
+// then |work_item_list| will still succeed if the registration fails and
+// no registration rollback will be performed.
 void AddRegisterComDllWorkItems(const base::FilePath& dll_folder,
                                 const std::vector<base::FilePath>& dll_files,
                                 bool system_level,
                                 bool do_register,
-                                bool best_effort,
+                                bool ignore_failures,
                                 WorkItemList* work_item_list);
 
 void AddSetMsiMarkerWorkItem(const InstallerState& installer_state,