[FileAPI-tests] Make new Blob throw (#1278)

Given https://www.w3.org/Bugs/Public/show_bug.cgi?id=22808 this will
likely need to throw. Feel free to defer until that actually happens
though.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1278

Received on Wednesday, 8 October 2014 07:34:23 UTC