Move temp file functions to base namespace.

chrome/browser/chromeos/drive/download_handler.cc

Index: chrome/browser/chromeos/drive/download_handler.cc
diff --git a/chrome/browser/chromeos/drive/download_handler.cc b/chrome/browser/chromeos/drive/download_handler.cc
index 1e84ac2caba2666af692f837a6cdf972731f2f4f..50599c3c16e9c6dd44d67cf13c50be5cedab79bb 100644
--- a/chrome/browser/chromeos/drive/download_handler.cc
+++ b/chrome/browser/chromeos/drive/download_handler.cc
@@ -60,8 +60,8 @@ base::FilePath GetDriveTempDownloadPath(
   DCHECK(created) << "Can not create temp download directory at "
                   << drive_tmp_download_dir.value();
   base::FilePath drive_tmp_download_path;
-  created = file_util::CreateTemporaryFileInDir(drive_tmp_download_dir,
-                                                &drive_tmp_download_path);
+  created = base::CreateTemporaryFileInDir(drive_tmp_download_dir,
+                                           &drive_tmp_download_path);
   DCHECK(created) << "Temporary download file creation failed";
   return drive_tmp_download_path;
 }