Remove HTTPS URL rewriting for older IE.

This code was breaking loading data over HTTPS in IE9/10. Issue noticed loading data from Google Doc URL with Timeline.js under HTTPS.

I created a build locally for testing this fix (but am not committing build files yet, which would muck up this commit).

We had a timeline under HTTPS loading data from a Google Doc url (also HTTPS), which was failing to load data in IE9/10 and Android 2.3 - we were getting an Access Denied Error. We traced this back to this URL rewriting code.

Why was the secure URL being rewritten?