[Qt][WK2] Title in MiniBrowser is not updated for a page with no title

[Qt][WK2] Title in MiniBrowser is not updated for a page with no title
https://bugs.webkit.org/show_bug.cgi?id=82483

Patch by Dinu Jacob <dinu.jacob@nokia.com> on 2012-04-13
Reviewed by Noam Rosenthal.

This fixes API tests broken by r113715.

* UIProcess/API/qt/tests/qmltests/WebView/tst_applicationScheme.qml:
* UIProcess/API/qt/tests/qmltests/WebView/tst_preferences.qml:
* UIProcess/API/qt/tests/qmltests/WebView/tst_titleChanged.qml:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114129 268f45cc-cd09-0410-ab3c-d52691b4dbfc