I lost google font when changing url from http to https

Go to my site, change http on address bar to https and you will see my page title font style Dancing Script(Google font) is changed. I tried this method but still not working. Anyone has any experience before?
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Instead of using a protocol in your URL, like

http://fonts.googleapis.com/css?family=Oswald

or

https://fonts.googleapis.com/css?family=Oswald

You can simply use

//fonts.googleapis.com/css?family=Oswald

and this should work more reliably.
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I found this method from here:
http://www.google.com.sg/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDQQFjAB&url=http%3A%2F%2Fcode.google.com%2Fp%2Fgooglefontdirectory%2Fissues%2Fdetail%3Fid%3D107&ei=gcwjU5SQF--TiAeKr4GABA&usg=AFQjCNGxesdWGzkN9Lnm8XR3i1Xh1Hck9w&sig2=xWlfx5PgopdeHU8pifaDUw&bvm=bv.62922401,d.aGc