[wrt][XWALK-1834] Add 2 new tcs for wrt-packagemgt-tizen-tests

Impacted Tc num(designed):New 2, UPdate 0, Delete 0
Unit test platform: Tizen
Unit test result summary:Pass 2, Fail 0,Block 0
[webapi] rename webapi-iap-w3c-tests to webapi-iap-xwalk-tests
[webapi] Fix security issues found by ZAP tool

- Remove 2 unreferenced file in sse
- Turn off AUTOCOMPLETE attribute in form input element
  containing password by using autocomplete="off"
Merge pull request #285 from haoxli/haoxli/webapi/zap-security

[webapi] Fix security issues found by ZAP tool
Merge pull request #284 from yunxliu/yunxliu/webapi/update_iap

[webapi] rename webapi-iap-w3c-tests to webapi-iap-xwalk-tests
[webapi][XWALK-1821] Remove 3 tests for Web Audio whose feature is out of the spec

- The activeSourceCount attribute has been removed from Web Audio spec

Impacted tests (approved): new 0, update 0, delete 3
Unit test Platform: Tizen IVI
Unit test result summary: pass 0, fail 0, block 0
[webapi][XWALK-1214] Create 16 tests for Native Client (NaCl)

- Tizen IVI doesn't support input type (file)
- Tizen IVI doesn't support gamepad API
- Press F11 will also revoke mouselock or tab fullscreen privilege when in browser fullscreen, but got failed.
- Implementation: https://github.com/crosswalk-project/crosswalk/pull/1801

Impacted tests (approved): new 16, update 0, delete 0
Unit test Platform: Tizen IVI
Unit test result summary: pass 8, fail 3, block 5
[webapi][XWALK-1684] Add test step to 6 manual tests for Canvas

Impacted tests(approved): new 0, update 6, delete 0
Unit test platform: Tizen IVI
Unit test result summary: pass 6, fail 0, block 0
Merge pull request #281 from linshen/add-xwalk-1834-tcs

[wrt][XWALK-1834] Add 2 new tcs for wrt-packagemgt-tizen-tests
[webapi] [XWALK-1870] Create /opt/usr/media/Others/ if not exists

Unit test Platform: Tizen IVI
Unit test result: verified, inst.sh.xpk can successfully execute
[webapi][XWALK-1797] Update a test description and change another one to designed

Impacted tests (approved): new 0, update 2, delete 0
Unit test Platform: Tizen IVI
Unit test result summary: pass 1, fail 0, block 0