Unreviewed GTK gardening.

Adding timeout expectations for two tests from the JSRegress suite that
were added in r140276. The timeouts are GTK-specific.
Expanding the main failure expectation for all Encrypted Media tests to
expect either failures or timeouts.

* platform/gtk/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140404 268f45cc-cd09-0410-ab3c-d52691b4dbfc