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
}
	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.eclipse.ui.internal.navigator.INavigatorContentService#
	 * createCommonContentProvider()
	 */
	public ITreeContentProvider createCommonContentProvider() {
		if (contentProviderInitialized) {
			return contentProvider;
		}
		synchronized (this) {
			if (contentProvider == null) {
				contentProvider = new NavigatorContentServiceContentProvider(
						this);
			}
			contentProviderInitialized = true;
		}
		return contentProvider;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.eclipse.ui.internal.navigator.INavigatorContentService#
	 * createCommonLabelProvider()
	 */
	public ILabelProvider createCommonLabelProvider() {
		if (labelProviderInitialized) {
			return labelProvider;
		}