https://bugs.webkit.org/show_bug.cgi?id=126685

Reviewed by Chris Fleizach.

Merged GTK and Mac tests into one cross-platform test that is
aware of the platform-specific differences by declaring which
elements are supported in which platforms and which platform
specific roles (if it's the case) should be expected.

* accessibility/roles-exposed-expected.txt: Renamed from LayoutTests/platform/gtk/accessibility/roles-exposed-expected.txt.
* accessibility/roles-exposed.html: Added.
* platform/gtk/accessibility/roles-exposed.html: Removed.
* platform/mac/accessibility/role-subrole-roledescription.html: Removed.
* platform/mac/accessibility/roles-exposed-expected.txt: Renamed from LayoutTests/platform/mac/accessibility/role-subrole-roledescription-expected.txt.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162067 268f45cc-cd09-0410-ab3c-d52691b4dbfc