Unreviewed GTK gardening.

* platform/gtk/TestExpectations: Skipping fast/dom/custom tests as the custom elements support is not yet enabled
on the GTK port. Adding crashing expectations for two IDB tests that regressed with r146540.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146573 268f45cc-cd09-0410-ab3c-d52691b4dbfc