Unreviewed GTK gardening.

* platform/gtk/TestExpectations: Updating expectations for two inspector tests.
Expanding expectation for media/encrypted-media/encrypted-media-syntax.html to expect timeouts as well.
Adding a flaky failure expectation for svg/custom/animation-currentColor.svg.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144035 268f45cc-cd09-0410-ab3c-d52691b4dbfc