Bug 11748 switch to new DecoratorManager API
From the workbench change notes: API changes IWorkbenchPartSite.getDecoratorManager() - As the DecoratorManager has proven to be required for more than just IWorkbenchPartSites we have moved getDecoratorManager() to IWorkbench and deprecated the getDecoratorManager() in IWorkbenchPartSite. The one in IWorkbenchPartSite will be removed after the other Eclipse components have had a chance to switch to the new API.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/browsing/JavaBrowsingPart.java
protected ILabelProvider createLabelProvider() {
		return new StandardJavaUILabelProvider(
						StandardJavaUILabelProvider.DEFAULT_TEXTFLAGS,
						StandardJavaUILabelProvider.DEFAULT_IMAGEFLAGS | JavaElementImageProvider.SMALL_ICONS,
						StandardJavaUILabelProvider.getAdornmentProviders(true, null)
						);
	}
	protected ILabelProvider createTitleProvider() {
		return new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_BASICS | JavaElementLabelProvider.SHOW_SMALL_ICONS);
	}
	protected final ILabelProvider getLabelProvider() {
		return fLabelProvider;
	}
	protected final ILabelProvider getTitleProvider() {
		return fTitleProvider;
	}
	/**
	 * Creates the the viewer of this part.
	 * 
	 * @param parent	the parent for the viewer
	 */
	protected StructuredViewer createViewer(Composite parent) {
		return new ProblemTableViewer(parent, SWT.SINGLE);
	}
	
	protected int getLabelProviderFlags() {
		return JavaElementLabelProvider.SHOW_BASICS | JavaElementLabelProvider.SHOW_OVERLAY_ICONS |
				JavaElementLabelProvider.SHOW_SMALL_ICONS | JavaElementLabelProvider.SHOW_VARIABLE | JavaElementLabelProvider.SHOW_PARAMETERS;
	}
	/**