[Retry] PPAPI: Add new PPB_FileRef.MakeDirectory to support exclusive operation

native_client_sdk/src/doc/devguide/coding/file-io.rst

 .. _devguide-coding-fileio:
 
 ########
 File I/O
 ########
 
 .. contents::
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   if (!file_system_ready_) {
     ShowErrorMessage("File system is not open", PP_ERROR_FAILED);
     return;
   }
   pp::FileRef ref(file_system_, dir_name.c_str());
 
 Then the ``pp::FileRef::MakeDirectory`` function is called.
 
 .. naclcode::
 
-  int32_t result = ref.MakeDirectory(pp::BlockUntilComplete());
+  int32_t result = ref.MakeDirectory(
+      PP_MAKEDIRECTORYFLAG_NONE, pp::BlockUntilComplete());
   if (result != PP_OK) {
     ShowErrorMessage("Make directory failed", result);
     return;
   }
   ShowStatusMessage("Make directory success");