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This is no longer needed as the underlying syscalls
unlink/rmdir and both intercepted at the IRT level.  I
believe this was overlooked when we fixed:
https://code.google.com/p/nativeclient/issues/detail?id=3709

This should fix the recent lua5.2 failures on the
naclports waterfall.

CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_nacl_sdk;tryserver.chromium.mac:mac_nacl_sdk;tryserver.chromium.win:win_nacl_sdk
BUG=487701

Review URL: https://codereview.chromium.org/1136953014

Cr-Commit-Position: refs/heads/master@{#329871}