Windows: Make file_util::Delete("c:\\foo_dir", false) work correctly. Add more unit tests for Delete

chrome/installer/util/delete_tree_work_item_unittest.cc

 // Copyright (c) 2006-2008 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 <windows.h>
 
 #include <fstream>
 #include <iostream>
 
 #include "base/base_paths.h"
@@ skipping 17 matching lines @@
 
       // Create a fresh, empty copy of this test directory.
       file_util::Delete(test_dir_, true);
       file_util::CreateDirectoryW(test_dir_);
 
       ASSERT_TRUE(file_util::PathExists(test_dir_));
     }
 
     virtual void TearDown() {
       // Clean up test directory
-      ASSERT_TRUE(file_util::Delete(test_dir_, false));
+      ASSERT_TRUE(file_util::Delete(test_dir_, true));
       ASSERT_FALSE(file_util::PathExists(test_dir_));
     }
 
     // the path to temporary directory used to contain the test operations
     FilePath test_dir_;
   };
 
   // Simple function to dump some text into a new file.
   void CreateTextFile(const std::wstring& filename,
                       const std::wstring& contents) {
@@ skipping 164 matching lines @@
 
   // verify everything is still there.
   EXPECT_TRUE(file_util::PathExists(key_path));
   EXPECT_TRUE(file_util::PathExists(file_name_delete_1));
   EXPECT_TRUE(file_util::PathExists(file_name_delete_2));
 
   TerminateProcess(pi.hProcess, 0);
   // make sure the handle is closed.
   WaitForSingleObject(pi.hProcess, INFINITE);
 }