GTK: Don't fail on startup with debug build.
GTK: Don't fail on startup with debug build.

I thought the check would never fail, but I found out how to trigger it, so it turns out to be necessary after all.

TBR=derat

Review URL: http://codereview.chromium.org/421011

git-svn-id: http://src.chromium.org/svn/trunk/src@32658 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4c1634ac069a9162bff6d17568ddafc737214f5f
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