Move directory creation functions to base namespace.

chrome/browser/history/history_backend_unittest.cc

Index: chrome/browser/history/history_backend_unittest.cc
diff --git a/chrome/browser/history/history_backend_unittest.cc b/chrome/browser/history/history_backend_unittest.cc
index 6a6554263c7dc4c0ab5a42fe778e0be4b00d0672..5d01cf1c039877c2138d8cfae3d3ad7ae6bd1776 100644
--- a/chrome/browser/history/history_backend_unittest.cc
+++ b/chrome/browser/history/history_backend_unittest.cc
@@ -1208,7 +1208,7 @@ TEST_F(HistoryBackendTest, MigrationVisitSource) {
   // in Teardown.
   base::FilePath new_history_path(getTestDir());
   base::DeleteFile(new_history_path, true);
-  file_util::CreateDirectory(new_history_path);
+  base::CreateDirectory(new_history_path);
   base::FilePath new_history_file =
       new_history_path.Append(chrome::kHistoryFilename);
   ASSERT_TRUE(base::CopyFile(old_history_path, new_history_file));
@@ -2556,7 +2556,7 @@ TEST_F(HistoryBackendTest, MigrationVisitDuration) {
   // in Teardown.
   base::FilePath new_history_path(getTestDir());
   base::DeleteFile(new_history_path, true);
-  file_util::CreateDirectory(new_history_path);
+  base::CreateDirectory(new_history_path);
   base::FilePath new_history_file =
       new_history_path.Append(chrome::kHistoryFilename);
   base::FilePath new_archived_file =