Add flaky test expectations to compositing/geometry/limit-layer-bounds-fixed.html
and fast/dom/MutationObserver/database-callback-delivery.html on Windows per bugs
112867 and 112868.

* platform/win/TestExpectations:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146428 268f45cc-cd09-0410-ab3c-d52691b4dbfc