The following code in java.desktop/share/classes/java/beans/SimpleBeanInfo.java assumes an ImageProducer returned by URL.getContent()
    public Image loadImage(final String resourceName) {
        try {
            final URL url = getClass().getResource(resourceName);
            if (url != null) {
                final ImageProducer ip = (ImageProducer) url.getContent();
                if (ip != null) {
                    return Toolkit.getDefaultToolkit().createImage(ip);
                }
            }
        } catch (final Exception ignored) {
        }
        return null;
    }

The spec. doesn't guarantee this.
SimpleBeanInfo should probably be migrated to some other API to interpret the image data
The test java/beans/SimpleBeanInfo/LoadingStandardIcons/LoadingStandardIcons.java
can be used to verify the migration

This would allow us to drop the SPI implemented by
sun/awt/www/content/MultimediaContentHandlers.java
The test java/beans/SimpleBeanInfo/LoadingStandardIcons/LoadingStandardIcons.java will fail if it isn't migrated.