This function will always return 0 if the
port is the default port for the given protocol. For example,
http://example.com has the same security origin as
http://example.com:80, and this function will return 0 for a
#WebKitSecurityOrigin constructed from either URI.
Gets the port of origin.
This function will always return 0 if the port is the default port for the given protocol. For example, http://example.com has the same security origin as http://example.com:80, and this function will return 0 for a #WebKitSecurityOrigin constructed from either URI.