Unreviewed GTK gardening.

* platform/gtk/TestExpectations: Adding a crashing expectation for the
ttp/tests/security/XFrameOptions/x-frame-options-deny-multiple-clients.html layout test. Skipping the perf/ tests when
using the debug build.
* platform/gtk/fast/text/shaping/shaping-selection-rect-expected.txt: Rebaselining after r147156.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147201 268f45cc-cd09-0410-ab3c-d52691b4dbfc