[webapi]update ref case from manual type to bdd

Impacted tests(approved):new 0,update 2,delete 0
Unit test platform:[Android]
Unit test result summary:pass 2,fail 0,block 0
Merge pull request #927 from chenxix/chenxi/misc-uiautomation/update-webstorage

[webapi]update ref case from manual type to bdd