Fix <rdar://5499507> FrameView will always have size (0,0) if its parent...

     Fix <rdar://5499507> FrameView will always have size (0,0) if its parent WebView is never resized

         Reviewed by Darin.

         * WebView.cpp:
         (WebView::initWithFrame): Set the main FrameView's size to the size of
         the WebView.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25709 268f45cc-cd09-0410-ab3c-d52691b4dbfc