Removing sniffing in the test

The test I'm removing used some sniffing that seems to be wrong,
the test is not self-explaining, why doing 
expect(div.style.filter.split('opacity').length - 1).toEqual(1); instead of toEqual(2)? probably an indexOf would have been better, also we are testing the implementation detail and not the expectation here, 
also IE8 introduced -ms-filter so x.filter should be (x.filter||x['-ms-filter']) and should be probably feature tested 
so that we test opacity first, if not then filter.
also this is at all effect a different test and should have been in a test alone.

Removing it as I'm removing all the sniffing anyway.