Bug 1461959 - Removed OSX 10.6 reference. r=gbrown

accessible/tests/mochitest/states/a11y.ini

@@ -19,7 +19,6 @@ support-files =
 [test_controls.xul]
 [test_doc.html]
 [test_doc_busy.html]
-skip-if = os == 'mac' && os_version == '10.6'
 [test_docarticle.html]
 [test_editablebody.html]
 [test_expandable.xul]