Bug 287621 [CommonNavigator] Add more tracing
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
extension = (NavigatorContentExtension) contentExtensions
								.get(key);
						iter.remove();
						extension.dispose();
					}
				}
			} catch (RuntimeException e) {
				String msg = e.getMessage() != null ? e.getMessage() : e
						.toString();
				NavigatorPlugin.logError(0, msg, e);
			}
		}
		update();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.navigator.INavigatorContentService#update()
	 */
	public void update() {
		rootContentProviders = null;
		if (structuredViewerManager != null) {
			structuredViewerManager.safeRefresh();
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.ui.internal.navigator.INavigatorContentService#getViewerId()