[webapi] update unitcommon.js for w3c nfc

- remove useless functions
- correct some type mistakes
- Failure analysis: nfc does not support

Impacted tests(approved): new 0, update 0, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 12, block 0
[cordova] Add 2 TCs to sampleapp
Merge pull request #625 from wanghongjuan/wanghongjuan/wrt/cordova

[cordova] Add 2 TCs to sampleapp
[misc] Recover test files integrated from Blink LayoutTests

- https://github.com/crosswalk-project/blink-crosswalk/tree/master/LayoutTests
- https://github.com/crosswalk-project/crosswalk-test-suite/pull/635
[misc] Update navigator.language test files

to reflect current being code structure
[usecase-webapi] Improve usecase for updating set name

- Categery:follow tizen.org catgory, update follow the set name
Merge pull request #655 from zhangjingx/zjx/webapi/nfc_modify

[webapi] update unitcommon.js for w3c nfc
[misc] Describe why need tests for NavigatorLanguage
[webapi][XWALK-1877] Fix bug of sso.

- Block Reason: tizen.sso not implement.

Impacted tests(approved): New 28, Update 0, Delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: Pass 0, Fail 0, Block 28
Merge pull request #656 from minxhuang/hm/webapi/sso-hotfix

[webapi][XWALK-1877] Fix bug of sso.
Merge pull request #657 from xinliux/xinliux/usecase/set-name

[usecase-webapi] Improve usecase for updating set name
Merge pull request #658 from zqzhang/zqzhang/pr635

[misc] Polish #635 of the NavigatorLanguage tests