Move directory creation functions to base namespace.

chrome/browser/extensions/api/developer_private/developer_private_api.cc

Index: chrome/browser/extensions/api/developer_private/developer_private_api.cc
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.cc b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
index 6c65d1e450995962751fc165f0c88ca5b7635f7a..79817f1e7c358a7715781c91e629abda31643ee7 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.cc
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.cc
@@ -1093,7 +1093,7 @@ void DeveloperPrivateExportSyncfsFolderToLocalfsFunction::SnapshotFileCallback(
 void DeveloperPrivateExportSyncfsFolderToLocalfsFunction::CopyFile(
     const base::FilePath& src_path,
     const base::FilePath& target_path) {
-  if (!file_util::CreateDirectory(target_path.DirName())) {
+  if (!base::CreateDirectory(target_path.DirName())) {
     SetError("Error in copying files from sync filesystem.");
     success_ = false;
   }