[Qt] Crash in PasteboardQt.cpp Pasteboard::writeSelection
https://bugs.webkit.org/show_bug.cgi?id=102192

Patch by Fabien Valée
Patch by Allan Sandfeld Jensen <allan.jensen@digia.com> on 2013-01-22
Reviewed by Jocelyn Turcotte.

QClipboard::setMimeData transfers ownership of QMimeData to the clipboard,
so we should not access it afterwards.

* platform/qt/PasteboardQt.cpp:
(WebCore::Pasteboard::writeSelection):
(WebCore::Pasteboard::writePlainText):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140423 268f45cc-cd09-0410-ab3c-d52691b4dbfc