Fix test failure in Chrome 51

[nmielnik]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
New tests added?	changed
License	MIT

Description

Now in Chrome 51, NodeList objects have defined a forEach method. There was a test that attempted to confirm that forEach wasn't defined on a NodeList to ensure that code that had depended on forEach was safely executing.

I've updated the test to assert that the NodeList is not an Array instead.

[coveralls]

Coverage remained the same at 94.969% when pulling 4a7c46e on chrome-test-fix into d496a1c on master.