Workaround mkdirs concurency problems

Use only mkdir since our usage is a simple case.

Bug: https://code.google.com/p/android/issues/detail?id=79388

(cherry picked from commit 8c2abf7f471b061b737e700af711e9d5d6883b40)

Change-Id: I0ddb054e73f12a212b411a906676b1843079a505
1 file changed