Update uses of TimeDelta in chrome/installer.

chrome/installer/util/copy_tree_work_item_unittest.cc

Index: chrome/installer/util/copy_tree_work_item_unittest.cc
diff --git a/chrome/installer/util/copy_tree_work_item_unittest.cc b/chrome/installer/util/copy_tree_work_item_unittest.cc
index 55df83be393df56070b3dd5535f7a0ca5d3cbf50..88cfc0680005b05d2ae1f51c1ce8d76f57c7c10d 100644
--- a/chrome/installer/util/copy_tree_work_item_unittest.cc
+++ b/chrome/installer/util/copy_tree_work_item_unittest.cc
@@ -472,7 +472,7 @@ TEST_F(CopyTreeWorkItemTest, NewNameAndCopyTest) {
       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());