Log readable versions of OS X keygen errors
Log readable versions of OS X keygen errors

This should make it easier to diagnose problems.

R=agl
BUG=48006
TEST=none

Review URL: http://codereview.chromium.org/2810044

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@51459 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser