[wrt]update xwalk web/audio to xwalk-launcher

Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 4, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 4 , Fail  0, Blocked 0
Merge pull request #441 from linshen/update-xwalk-co

[wrt]update xwalk web/audio to xwalk-launcher