[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