Reviewed by Darin.

    Reviewed by Darin.

        <rdar://problem/5498016> Photoshop CS3: Adobe Help Viewer 1.1 crashes in 9A553

        WebKit started calling the mouseDidMoveOverElement delegate method with a nil dictionary in r14982.
        We originally intended to call this delegate method sometimes with a nil dictionary, but due to
        a bug dating back to WebKit 1.0 this delegate was never called with nil! Unfortunately we can't
        start calling this with nil since it will break Adobe Help Viewer, and possibly other clients.

        * WebView/WebView.mm:
        (-[WebView _mouseDidMoveOverElement:modifierFlags:]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@25718 268f45cc-cd09-0410-ab3c-d52691b4dbfc