[misc][XWALK-1063]Add usecase for websetting

- Fail Reason: the spec is not supported

Impacted TCs num(designed): New 1, Update 0, Delete 0
Unit test Platform: [Tizen IVI]
Test result summary: Pass 0, Fail 1, Blocked 0
Merge pull request #490 from JianfengXu/xujf/misc/websetting

[usecase-webapi][XWALK-1063]Add usecase for websetting