[Qt][Wk2] Unreviewed gardening. Added platform specific expected.

* platform/qt-5.0-wk2/fast/multicol/shrink-to-column-height-for-pagination-expected.txt: Update after r141459.
* platform/qt-5.0-wk2/http/tests/cache/cancel-multiple-post-xhrs-expected.txt: Added update after r140174.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141875 268f45cc-cd09-0410-ab3c-d52691b4dbfc