Update uses of TimeDelta in chrome/installer.

chrome/installer/util/copy_tree_work_item_unittest.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 <windows.h>
 
 #include <fstream>
 
 #include "base/base_paths.h"
 #include "base/file_util.h"
@@ skipping 454 matching lines @@
   EXPECT_TRUE(WaitForSingleObject(pi.hProcess, 10000) == WAIT_OBJECT_0);
   CloseHandle(pi.hProcess);
   CloseHandle(pi.hThread);
 
   // Now the process has terminated, lets try overwriting the file again
   work_item.reset(WorkItem::CreateCopyTreeWorkItem(
       file_name_from, file_name_to,
       temp_dir_.path(), WorkItem::NEW_NAME_IF_IN_USE,
       alternate_to));
   if (IsFileInUse(file_name_to))
-    base::PlatformThread::Sleep(2000);
+    base::PlatformThread::Sleep(base::TimeDelta::FromSeconds(2));
   // If file is still in use, the rest of the test will fail.
   ASSERT_FALSE(IsFileInUse(file_name_to));
   EXPECT_TRUE(work_item->Do());
 
   // Get the path of backup file
   FilePath backup_file(work_item->backup_path_.path());
   EXPECT_FALSE(backup_file.empty());
   backup_file = backup_file.AppendASCII("File_To");
 
   EXPECT_TRUE(file_util::PathExists(file_name_from));
@@ skipping 228 matching lines @@
   EXPECT_TRUE(file_util::ContentsEqual(file_name_from_1, file_name_to_1));
 
   FilePath file_name_to_2(dir_name_to);
   file_name_to_2 = file_name_to_2.AppendASCII("2");
   file_name_to_2 = file_name_to_2.AppendASCII("File_2.txt");
   EXPECT_TRUE(file_util::PathExists(file_name_to_2));
   VLOG(1) << "compare " << file_name_from_2.value()
           << " and " << file_name_to_2.value();
   EXPECT_TRUE(file_util::ContentsEqual(file_name_from_2, file_name_to_2));
 }