Move some more file utils to the base namespace.

webkit/browser/fileapi/native_file_util.cc

Index: webkit/browser/fileapi/native_file_util.cc
diff --git a/webkit/browser/fileapi/native_file_util.cc b/webkit/browser/fileapi/native_file_util.cc
index df290c5e7e2e1c51468b566a70ae5f32a404b142..48569d50e945cdd1be89556078f308705d20c38f 100644
--- a/webkit/browser/fileapi/native_file_util.cc
+++ b/webkit/browser/fileapi/native_file_util.cc
@@ -264,7 +264,7 @@ PlatformFileError NativeFileUtil::DeleteDirectory(const base::FilePath& path) {
     return base::PLATFORM_FILE_ERROR_NOT_FOUND;
   if (!base::DirectoryExists(path))
     return base::PLATFORM_FILE_ERROR_NOT_A_DIRECTORY;
-  if (!file_util::IsDirectoryEmpty(path))
+  if (!base::IsDirectoryEmpty(path))
     return base::PLATFORM_FILE_ERROR_NOT_EMPTY;
   if (!base::DeleteFile(path, false))
     return base::PLATFORM_FILE_ERROR_FAILED;