Reviewed by Adam.

        Forward mouse move events to the Netscape plug-in view.
        
        * Plugins/WebBaseNetscapePluginView.h:
        * Plugins/WebBaseNetscapePluginView.mm:
        (-[WebBaseNetscapePluginView handleMouseMoved:]):
        New method that just calls the current event handler.
        
        * Plugins/WebNetscapePluginEventHandlerCocoa.mm:
        (WebNetscapePluginEventHandlerCocoa::flagsChanged):
        NSFlagsChanged is not a regular keyboard event and some of the NSEvent accessors
        don't work on it so don't call them.
        
        * WebCoreSupport/WebFrameLoaderClient.mm:
        (NetscapePluginWidget::NetscapePluginWidget):
        New Widget subclass to be used for Netscape plug-ins.
        
        (NetscapePluginWidget::handleEvent):
        Forward NSMouseMoved events to the plug-in.
        
        (WebFrameLoaderClient::createPlugin):
        Wrap the plug-in view in a NetscapePluginWidget.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@32770 268f45cc-cd09-0410-ab3c-d52691b4dbfc