More cleaning up of skipped tests.

* platform/mac-wk2/TestExpectations:
Remove tests that now pass.
* platform/mac/TestExpectations:
Remove an entry for a bug that has been closed and whose test works just fine on both WK1
and WK2.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148722 268f45cc-cd09-0410-ab3c-d52691b4dbfc