Unreviewed GTK gardening.

* platform/gtk/TestExpectations: Unskipping the fast/sub-pixel layout tests.
Removing failure expectations for tests that are passing after the subpixel layout was enabled.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148871 268f45cc-cd09-0410-ab3c-d52691b4dbfc