Bug 189490 [CommonNavigator] Go To->Resource won't enable
I0524 1. Open the Project Explorer in the Resource perspective 2. Create a vanilla project P 3. Create a folder F 4. Create a file resource R Open the Navigate->Go To file. "Resource..." will remain disabled.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
return extension;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.eclipse.ui.internal.navigator.INavigatorContentService#
	 * getViewerDescriptor()
	 */
	public INavigatorViewerDescriptor getViewerDescriptor() {
		return viewerDescriptor;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.internal.navigator.INavigatorContentService#restoreState
	 * (org.eclipse.ui.IMemento)
	 */
	public void restoreState(final IMemento aMemento) {
		synchronized (this) {
			List runnables = new ArrayList();
			for (Iterator extensionItr = getExtensions().iterator(); extensionItr
					.hasNext();) {
				final NavigatorContentExtension element = (NavigatorContentExtension) extensionItr
						.next();
				ISafeRunnable runnable = new ISafeRunnable() {
					public void run() throws Exception {
						element.restoreState(aMemento);
					}
					public void handleException(Throwable exception) {