net: fix leak in SSLHostInfo's DNS request.
net: fix leak in SSLHostInfo's DNS request.

I'm too used to callbacks which delete themselves and forgot to delete
it myself in r70631.

BUG=68820
TEST=valgrind

git-svn-id: http://src.chromium.org/svn/trunk/src@70737 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5048b23b506deb92c2458ccb9ba31b0a19831605
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