Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/window/ApplicationWindow.java
* Menu bar manager, or <code>null</code> if none (default).
	 *
	 * @see #addMenuBar
	 */
	private MenuManager menuBarManager = null;
	/**
	 * Tool bar manager, or <code>null</code> if none (default).
	 *
	 * @see #addToolBar
	 */
	private ToolBarManager toolBarManager = null;
	/**
	 * Status line manager, or <code>null</code> if none (default).
	 *
	 * @see #addStatusLine
	 */
	private StatusLineManager statusLineManager = null;
	
	/**
	 * A flag indicating that an operation is running.
	 */
	private boolean operationInProgress = false;
	
	/**
	 * Internal application window layout class.
	 * This vertical layout supports a tool bar area (fixed size),
	 * a separator line, the content area (variable size), and a 
	 * status line (fixed size).
	 */
	 class ApplicationWindowLayout extends Layout {