[Mac][WebKit2] The test images-enabled-unset-can-block-image-and-can-reload-in-place.html passes

Unreviewed.

Patch by Benjamin Poulain <bpoulain@apple.com> on 2013-04-08

* platform/mac-wk2/TestExpectations:
This test have been passing reliably for many revisions and pass locally.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147961 268f45cc-cd09-0410-ab3c-d52691b4dbfc