[usecase-webapi] Improve Video for usecase

- Remove "For Tizen" and "For Android" in tests purpose
- PR-657 affect tests.tizen.xml and tests.android.xml, so update it again.

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: Tizen M0
Tizen test result summary: Pass 1, Fail 0, Blocked 0
Merge pull request #690 from xinliux/xinliux/usecase/video-update

[usecase-webapi] Improve Video for usecase
[wrt] Update test script to fix case bug in wrt-extension-android-tests
Merge pull request #761 from kangxu/kangxu/wrt/wrt-extension-android-tests/updateCase

[wrt] Update test script to fix case bug in wrt-extension-android-tests
[misc] Add a note that web worker doesn't support navigator language

There is an Intent to Implement in blink-dev mailing list:
navigator.language(),navigator.languages() and languagechange event for web workers.
[usecase-wrt]update check db to pkginfo --listpkg

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 2, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 2, Fail 0, Blocked 0
[wrt] Update json and steps with Crosswalk 8 standard
Merge pull request #750 from kangxu/kangxu/wrt/wrtcases/update

[wrt] Update json and steps with Crosswalk 8 standard
Merge pull request #763 from linshen/shen/misc/add-version

[usecase-wrt]update check db to pkginfo --listpkg
Merge pull request #764 from zqzhang/zqzhang/navigator-language-workers

[misc] Add a note that web worker doesn't support navigator language