[Tizen][Desktop] WebApp is able to access files via file:// protocol

This change allows an application to access files via file:// protocol
if its manifest contains 'csp' field and the applied policy allows
fetching from 'localhost' (e.g. "csp": "default-src file://localhost").

The application should use the URLs in the following format:
file://localhost/path/to/the/local/file

BUG=XWALK-1840
@kenchris 
I've go through the http://w3c.github.io/manifest-csp/ spec, and found that it talked about the CSP1.1, did not mention about how to open a navigation link (inside or outside the xwalk runtime), isn't it?