Change pnacl-nmf "open" calls to "DriverOpen". Otherwise it will try to open cygwin paths in native windows.
Change pnacl-nmf "open" calls to "DriverOpen".
Otherwise it will try to open cygwin paths in native windows.

BUG= http://code.google.com/p/nativeclient/issues/detail?id=2546
TEST= run_pnacl_example_browser_test
Review URL: https://chromiumcodereview.appspot.com/9562025

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7921 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client