In revision r151852, the accessibility/media-element-pretty-diff.html test was expanded to also print subroles whenever available, but is always assuming that at least the "AXSubrole: " string will be returned when reading the .subrole property, which does not apply to platforms not supporting subroles, like ATK.
Created attachment 205706 [details]
I believe this extra nullcheck would be enough to make the GTK bots happy again, without disturbing others
Comment on attachment 205706 [details]
Attachment 205706 [details] did not pass mac-wk2-ews (mac-wk2):
New failing tests:
Created attachment 205717 [details]
Archive of layout-test-results from webkit-ews-14 for mac-mountainlion-wk2
The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: webkit-ews-14 Port: mac-mountainlion-wk2 Platform: Mac OS X 10.8.3
Committed r152172: <http://trac.webkit.org/changeset/152172>