[usecase-wrt][XWALK-1492][XWALK-2058] update wgt content to host site

[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
Merge pull request #898 from linshen/shenlin/usecase/content

[usecase-wrt][XWALK-1492][XWALK-2058] update wgt content to host site