[webapi][XWALK-3189] Remove 2 cases for CSP

- Due to these 2 case need be written, so remove firstly.

Impacted TCs num: New 0, Update 0, Delete 2
Unit test Platform: [Tizen-IVI]
Unit test result summary: Pass 0, Fail 0, Blocked 0
Merge pull request #1523 from JianfengXu/tct/csp/3189

[webapi][XWALK-3189] Remove 2 cases for CSP