https://bugs.webkit.org/show_bug.cgi?id=97124
Mark a couple of WK2 tests as possibly asserting in debug.

* platform/mac-wk2/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146015 268f45cc-cd09-0410-ab3c-d52691b4dbfc