MacRuby web browser, needs links to open default browser

AppDelegate.rb

framework "WebKit"

class AppDelegate
    attr_accessor :window

    def applicationDidFinishLaunching(notification)
        load_web_view
    end

    def load_web_view
        web_view = WebView.new
        request = NSURLRequest.requestWithURL(NSURL.URLWithString("http://example.com"))
        web_view.mainFrame.loadRequest(request)
        window.contentView = web_view
        web_view.frameLoadDelegate = self
        web_view.setPolicyDelegate(self)   # so each link click calls the following method
    end

    # this is supposed to make it so links open in the default browser
    def webView(view, decidePolicyForNavigationAction:actionInformation, request:request, frame:frame, decisionListener:listener)
        puts 'running nav policy'
        listener.ignore
        NSWorkspace.sharedWorkspace.openURL(request.URL)
    end
end