[usecase][XWALK-3089] Update csp case to fix xwalk-3089

- Because we not sure if this is a feature issue and the case purpose is to check whether the CSP(default-src self) only allow the local font source loaded, so remove the div log without any css style to avoid this issue.

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: [Tizen-IVI]
Unit test result summary: Pass 1, Fail 0, Blocked 0