Bug 315281 update copyrights for 3.6
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorContentDescriptorManager.java
ImageDescriptor imageDescriptor = AbstractUIPlugin
							.imageDescriptorFromPlugin(contentDescriptor
							.getContribution().getPluginId(), icon);
					if (imageDescriptor != null) {
						image = imageDescriptor.createImage();
						if (image != null) {
							getImageRegistry().put(icon, image);
						}
					}
				}
			}
		}
		return image;
	}
	/**
	 * @param desc
	 */
	private void addNavigatorContentDescriptor(NavigatorContentDescriptor desc) {
		if (desc == null) {
			return;
		}
		synchronized (firstClassDescriptorsMap) {
			if (firstClassDescriptorsMap.containsKey(desc.getId())) {
				NavigatorPlugin
						.logError(
								0,
								"An extension already exists with id \"" + desc.getId() + "\".", null); 
			} else {
				if (desc.getSuppressedExtensionId() == null) {
					firstClassDescriptorsMap.put(desc.getId(), desc);