[webapi] Fix XWALK-1409 for not follow spec
Merge pull request #159 from jieqiongxcui/cjq/webapi/xwalk-1409

[webapi] Fix XWALK-1409 for not follow spec
[webapi] Create tests for Crosswalk DLNA MediaContainer and MediaServer
[webapi] Remove -manual suffix from Background reftests
[webapi] Import reference files for CSS Filter tests
[webapi] Import reftest for CSS fonts
[webapi] Import reference files for CSS Background tests