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/wizard/WizardDialog.java
* @param c the composite
		 * @return the client area rectangle
		 */
		public Rectangle getClientArea(Composite c) {
		    Rectangle rect = c.getClientArea();
		    rect.x = rect.x + marginWidth;
		    rect.y = rect.y + marginHeight;
		    rect.width = rect.width - 2 * marginWidth;
		    rect.height = rect.height - 2 * marginHeight;
		    return rect;
		}
		/* (non-Javadoc)
		 * Method declared on Layout.
		 */
		public void layout(Composite composite, boolean force) {
		    Rectangle rect = getClientArea(composite);
		    Control[] children = composite.getChildren();
		    for (int i = 0; i < children.length; i++) {
		        children[i].setBounds(rect);
		    }
		}
		/**
		 * Lays outs the page according to this layout.
		 *
		 * @param w the control
		 */
		public void layoutPage(Control w) {
		    w.setBounds(getClientArea((Composite) w.getParent()));
		}
		/**