open sans condensed problem with protocol-less URL

[GoogleCodeExporter]

What steps will reproduce the problem?
1. import font in CSS using @import 
url(//fonts.googleapis.com/css?family=Open+Sans+Condensed:700);
2. launch web page in Internet Explorer v8 or v9 (possibly others, haven't 
tested)
3. page generates a secure/insecure content warning (SEC7111: HTTPS security is 
compromised by 
http://fonts.gstatic.com/s/opensanscondensed/v10/gk5FxslNkTTHtojXrkp-xJhsE6jcpsD
2oq89kgohWx0.ttf)

What is the expected output? What do you see instead?
For there not to be a warning as the font *should* be loaded from the same URL 
as used by the web page i.e. an https URL
Note that other Google web fonts used in the same page work fine e.g. Roboto - 
as do other variants of Open Sans (just seems to be condensed that has the 
issue)

What version of the product are you using? On what operating system?
Testing mainly done in IE9 on Windows 7

Please provide any additional information below.

Original issue reported on code.google.com by mleat...@gmail.com on 11 Mar 2015 at 5:49