Fix wide/ASCII conversion for CrOS testing.

I broke this when removing WideToASCII.

TBR=sky

Review URL: https://codereview.chromium.org/197283023

git-svn-id: http://src.chromium.org/svn/trunk/src/chrome/test/pyautolib@257289 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed