Unreviewed GTK gardening.

* platform/gtk/TestExpectations: Adding failure expectations for tests that regressed after r140202.
* platform/gtk/fast/js/global-constructors-expected.txt: Rebaselining after IDB support was enabled.
* platform/gtk/http/tests/cache: Added.
* platform/gtk/http/tests/cache/cancel-multiple-post-xhrs-expected.txt: Added. Required after r140174,
only due to difference in the form of the errors being logged.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140240 268f45cc-cd09-0410-ab3c-d52691b4dbfc