[wrt][XWALK-1513] Update security policy test for ivi path change

- After xwalk-1513 feature resolved, we need to update the test steps, then test it on IVI device.

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: IVI
Tizen test result summary: Pass 1, Fail 0, Block 0
Merge pull request #396 from wanghongjuan/wanghongjuan/behavior/xwalk-1513

[wrt][XWALK-1513] Update security policy test for ivi path change