Make an error message verbose to investigate a un-reproducible bug.
Make an error message verbose to investigate a un-reproducible bug.

BUG=35198
TEST=none
Review URL: http://codereview.chromium.org/1528018

git-svn-id: http://src.chromium.org/svn/trunk/src@43686 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5451b1648790573a58fafe34aac57cc94583996e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser