[usecase] Update TC name

Impacted TCs num(designed): New 0, Update 1, Delete 0
[usecase-webapi][XWALK-2353] Update the url path for mediarenderer

- Update the url path to absolute path
- Failure analysis: The prefetchURI method and mute method cannot work

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

[Detailed commit message (if have)]
Impacted TCs num(approved): New 0, update 1, deleted 0
Unit test platform: [tizen]
Unit test result summary:Pass 0, Fail 1,Block 0
BUGID:https://crosswalk-project.org/jira/browse/XWALK-2562
Merge pull request #913 from wanghongjuan/wanghongjuan/usecase/1947

[usecase] Update TC name
Merge pull request #916 from linshen/shenlin/wert/updatepaused

[usecase-wrt]update test step for AudioPolicy
Merge pull request #914 from yunxliu/yunxliu/misc/mediarenderer

[usecase-webapi][XWALK-2353] Update the url path for mediarenderer
Update index.html