Bug 305800 [CommonNavigator] Small tracing improvement
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/extensions/NavigatorContentDescriptor.java
*         override another extension.
	 */
	public OverridePolicy getOverridePolicy() {
		return overridePolicy;
	}
	/**
	 * @return Returns the contribution.
	 */
	public IPluginContribution getContribution() {
		return contribution;
	}
	/**
	 * The content provider could be an instance of
	 * {@link ICommonContentProvider}, but only {@link ITreeContentProvider} is
	 * required.
	 * 
	 * 
	 * @return An instance of the Content provider defined for this extension.
	 * @throws CoreException
	 *             if an instance of the executable extension could not be
	 *             created for any reason
	 * 
	 */
	public ITreeContentProvider createContentProvider() throws CoreException {
		return (ITreeContentProvider) configElement
				.createExecutableExtension(ATT_CONTENT_PROVIDER);
	}
	/**
	 * 
	 * The content provider could be an instance of {@link ICommonLabelProvider},