Fix manual tests that got broken by the move of WebCore into Source

* manual-tests/plugins/object-clipping.html:
* manual-tests/pointer-events.html:
* manual-tests/video-waiting-seeking.html:
Updated some paths.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86455 268f45cc-cd09-0410-ab3c-d52691b4dbfc
4 files changed