don't include about:linux-proxy-config in about:about
don't include about:linux-proxy-config in about:about

It's an error page and only shown on systems where something has gone
wrong.

Review URL: http://codereview.chromium.org/6027001

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@69566 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