Add best-effort/allow rollback flags on WorkItem.

chrome/installer/setup/install_worker_unittest.cc

Index: chrome/installer/setup/install_worker_unittest.cc
diff --git a/chrome/installer/setup/install_worker_unittest.cc b/chrome/installer/setup/install_worker_unittest.cc
index 8907a53abffcb5226aee5ff9258720f9b8adab8a..030cc7ca5a56a95829a7007cef4ee0e9f79eb4aa 100644
--- a/chrome/installer/setup/install_worker_unittest.cc
+++ b/chrome/installer/setup/install_worker_unittest.cc
@@ -66,10 +66,6 @@ class MockWorkItemList : public WorkItemList {
   MOCK_METHOD4(
       AddDeleteRegValueWorkItem,
       WorkItem*(HKEY, const std::wstring&, REGSAM, const std::wstring&));
-  MOCK_METHOD3(AddDeleteTreeWorkItem,
-               WorkItem*(const base::FilePath&,
-                         const base::FilePath&,
-                         const std::vector<base::FilePath>&));
   MOCK_METHOD2(AddDeleteTreeWorkItem,
                WorkItem*(const base::FilePath&, const base::FilePath&));
   MOCK_METHOD4(AddMoveTreeWorkItem,
@@ -463,8 +459,7 @@ TEST_F(InstallWorkerTest, TestInstallChromeSingleSystem) {
       WorkItem::CreateSetRegValueWorkItem(
           kRegRoot, kRegKeyPath, WorkItem::kWow64Default, L"", L"", false));
   std::unique_ptr<DeleteTreeWorkItem> delete_tree_work_item(
-      WorkItem::CreateDeleteTreeWorkItem(base::FilePath(), base::FilePath(),
-                                         std::vector<base::FilePath>()));
+      WorkItem::CreateDeleteTreeWorkItem(base::FilePath(), base::FilePath()));
   std::unique_ptr<DeleteRegKeyWorkItem> delete_reg_key_work_item(
       WorkItem::CreateDeleteRegKeyWorkItem(kRegRoot, kRegKeyPath,
                                            WorkItem::kWow64Default));