WebEngine#load and WebEngine#loadContents have memory leak problem.

I call these method repeatedly. JVM's Private Working Set increase to over 1GB and then crash VM.
JVM Memory (Heap and Non Heap) seems have no problems.

I can always reproduce problem when I run below code.
{code}
package ex;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class Main extends Application {

public static void main(String[] args) {
launch(args);
}

WebView browser;
WebEngine engine;
TextField urlField;
Button loadButton;

int i = 0;

String[] urls = new String[] {
"http://www.google.co.jp",
"http://www.yahoo.co.jp",
"http://jp.msn.com",
"http://www.goo.ne.jp",
"http://www.facebook.com",
"http://twitter.com",
"http://www.yahoo.com",
"http://en.wikipedia.org",
"http://www.disney.co.jp",
"http://www.hotpepper.jp/A_30300/svcSA11.html",
"http://tabelog.com",
"http://www.nttdocomo.co.jp/",
};

@Override
public void start(Stage stage) throws Exception {
urlField = new TextField();
urlField.setMinWidth(480);
loadButton = new Button("Go");
loadButton.setOnAction(onButtonClicked);
HBox pane = new HBox();
pane.getChildren().addAll(urlField, loadButton);

browser = new WebView();
engine = browser.getEngine();
BorderPane parent = new BorderPane();
parent.setCenter(browser);
parent.setBottom(pane);

Scene scene = new Scene(parent, 640, 480);
stage.setScene(scene);
stage.show();

new Thread(new Runnable() {

@Override
public void run() {
while (true) {

Platform.runLater(new Runnable() {
@Override
public void run() {
engine.load(urls[i]);
}
});

try {
Thread.sleep(5000);
} catch (InterruptedException e) {}
i++;
if (i > urls.length) i = 0;
}
}
}).start();
}

EventHandler<ActionEvent> onButtonClicked = new EventHandler<ActionEvent>() {

@Override
public void handle(ActionEvent event) {
String url = urlField.getText();
engine.load(url);
}

};

}

{code}