Unreviewed GTK build fix after r148311.

* UIProcess/API/gtk/WebKitWebViewBase.cpp:
(resizeWebKitWebViewBaseFromAllocation): Passing IntSize() as the scroll offset
argument to the DrawingAreaProxy::setSize method.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148351 268f45cc-cd09-0410-ab3c-d52691b4dbfc