Bug 287103 [CommonNavigator] contentServiceLabelProvider doesn't properly implement overrides
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
if (extensions.size() == 0) {
			return NO_LABEL_PROVIDERS;
		}
		List resultProvidersList = new ArrayList();
		for (Iterator itr = extensions.iterator(); itr.hasNext();) {
			resultProvidersList.add(((NavigatorContentExtension) itr.next()).getLabelProvider());
		}
		return (ILabelProvider[]) resultProvidersList.toArray(new ILabelProvider[resultProvidersList.size()]);
	}
	/**
	 * Search for extensions that declare the given element in their
	 * <b>triggerPoints</b> expression.
	 * 
	 * @param anElement
	 *            The element to use in the query
	 * @return The set of {@link INavigatorContentExtension}s that are
	 *         <i>visible</i> and <i>active</i> for this content service and
	 *         either declared through a
	 *         <b>org.eclipse.ui.navigator.viewer/viewerContentBinding</b> to be
	 *         a root element or have a <b>triggerPoints</b> expression that is
	 *         <i>enabled</i> for the given element.
	 */
	public Set findRootContentExtensions(Object anElement) {
		return findRootContentExtensions(anElement, true);
	}
	/**
	 * Search for extensions that declare the given element in their
	 * <b>triggerPoints</b> expression.
	 * 
	 * @param anElement