[webapi] Integrate 259 tests for IndexedDB

 - designed: 1, approved: 258
 - about 9 tests have been deleted

Impacted tests(approved): new 256, update 2, delete 0
Unit test platform: [Tizen IVI][Android]
Unit test result summary: pass 258, fail 0, block 0
Merge pull request #1177 from yunxiaoxie/move-indexeddb

[webapi] Integrate 259 tests for IndexedDB