[webapi] Integrate 54 tests for W3C Selectors Level1

- approved: 36
- Another 18 cases about w3c/level1-content.html have been integrated.

Impacted tests(approved): new 36, update 0, delete 0
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 36, fail 0, block 0