remove obsolete android cors workaround

This piece of code was here at initial commit.
- Maybe it was useful in 2012 but I don't see the bug anymore on recent version of Chrome for android.
- it breaks strict APIS

Tested on: 

- Android 4.4.4
- Chrome 38

Remote Server is sending appropriate CORS headers with the help of this library:

https://github.com/yogsototh/fuck-cors