[wrt][xwalk-2412] Update case description

Impacted TCs num(approved): New 0, Update 1, Delete 0
Unit test Platform: Android
Android test result summary: Pass 1, Fail 0, Block 0
[wrt][xwalk-1507/1508/1509/1510] Move 4 TCs from tizen2.3/wrt

- Those TCs feature has not been resolved

Impacted TCs num(designed): New 4, Update 0, Delete 0
[behavior][wrt]mapping legacy tcs

[Detailed commit message (if have)]
Impacted TCs num(approved): New 2, update 0, deleted 0
Unit test platform: [tizen]
Unit test result summary: Pass 2, Fail 0, Blocked 0
Merge pull request #808 from wanghongjuan/wanghongjuan/wrt/xwalk-2412

[wrt][xwalk-2412] Update case description
Merge pull request #809 from wanghongjuan/wanghongjuan/wrt/tizen-legacy

[wrt][xwalk-1507/1508/1509/1510] Move 4 TCs from tizen2.3/wrt
Merge pull request #812 from linshen/wrt/shen/gerrit-github

[behavior][wrt][XWALK-1492]mapping legacy tcs
[sample] Remove XML styles

- These style files are not must for the samples, and
  they are from testkit-lite repo under GPL 2.0 License
[sample] Remove trailing space from suite.json
Merge pull request #817 from zqzhang/remove-xsl

[sample] Remove XML styles