<rdar://problem/4404652> Netscape plug-in mouse events broken in HiDPI

        Multiply global mouse coordinates by the window scale factor so that plug-ins can use GlobalToLocal() in HiDPI.
        This fixes many bugs involving plug-in mouse event handling in HiDPI.  Most notably, the Flash player will now
        correctly respond to clicks.

        * Plugins/WebBaseNetscapePluginView.m:
        (+[WebBaseNetscapePluginView getCarbonEvent:]):
        (-[WebBaseNetscapePluginView getCarbonEvent:withEvent:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15278 268f45cc-cd09-0410-ab3c-d52691b4dbfc