[webapi] Integrate 57 tests for XmlHttpRequest

 - designed: 10, approved: 47

Impacted tests(approved): new 47, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 47, fail 0, block 0
Merge pull request #1183 from yunxiaoxie/move-httprequest

[webapi] Integrate 57 tests for XmlHttpRequest