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
*/
	public void dispose() {
		if (navigatorSaveablesService != null) {
			assistant.removeListener(navigatorSaveablesService);
		}
		for (Iterator contentItr = contentExtensions.values().iterator(); contentItr
				.hasNext();) {
			((NavigatorContentExtension) contentItr.next()).dispose();
		}
		getActivationService().removeExtensionActivationListener(this);
		assistant.dispose();
	}
	protected void updateService(Viewer aViewer, Object anOldInput,
			Object aNewInput) {
		synchronized (this) {
			if (structuredViewerManager == null) {
				structuredViewerManager = new StructuredViewerManager(aViewer);
				structuredViewerManager.inputChanged(anOldInput, aNewInput);
			} else {
				structuredViewerManager.inputChanged(aViewer, anOldInput,
						aNewInput);
			}
			for (Iterator contentItr = contentExtensions.values().iterator(); contentItr
					.hasNext();) {
				NavigatorContentExtension ext = (NavigatorContentExtension) contentItr
						.next();
				if (ext.isLoaded()) {
					structuredViewerManager
							.initialize(ext.getContentProvider());
				}