Fix autoinstall -- use urllib2 and https urls.

- pypi http redirects to https, but can be buggy
- urllib does not respect HTTPS_PROXY

This reverts dpranke's patch (7dadfdcc3).

BUG=230706
TBR=eseidel

Review URL: https://chromiumcodereview.appspot.com/18562014

git-svn-id: svn://svn.chromium.org/blink/trunk@154175 bbb929c8-8fbe-4397-9dbb-9b2b20218538