[webapi] Remove some tests of HTML iframe

- remove: 12, update: 2

Impacted tests(approved): new 0, update 2, delete 12
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 2, fail 0, block 0
Merge pull request #1223 from xinliux/sandbox-remove

[webapi] Remove some tests of HTML iframe