[Crosswalk-9][wrt-usecase] Update 2 TCs for OpenFile

Impacted TCs num(approved): New 0, Update 2, Delete 0
Unit test Platform: Android
Android test result summary: Pass 2, Fail 0, Block 0
Merge pull request #1039 from wanghongjuan/Crosswalk-9

[Crosswalk-9][wrt-usecase] Update 2 TCs for OpenFile
[Crosswalk-9][webapi]Delete manual tests moved to usecase
Merge pull request #1075 from yunxliu/Crosswalk-9

Crosswalk 9
[Crosswalk-9][usecase-webapi][XWALK-2560] Fix bug for mediaserver

- Fix bug for mediaserver
- Failure analysis: https://crosswalk-project.org/jira/browse/XWALK-1701

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 1, block 0
Merge pull request #1082 from yunxliu/Crosswalk-9

[Crosswalk-9][usecase-webapi][XWALK-2560] Fix bug for mediaserver
[Crosswalk-9][webapi][XWALK-2572] Fix bug for mediaserver

- Fix bug for mediaserver
- Failure analysis: https://crosswalk-project.org/jira/browse/XWALK-1699

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Tizen IVI]
Unit test result summary: pass 0, fail 1, block 0
Merge pull request #1083 from yunxliu/Crosswalk-9

[Crosswalk-9][webapi][XWALK-2572] Fix bug for mediaserver
[Crosswalk-9][webapi][XWALK-2593] Fix bug for webrtc

- Fix bug for webrtc
- Failure analysis: https://crosswalk-project.org/jira/browse/XWALK-2593

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