removed warning

plugins/org.yakindu.sct.simulation.ui/src/org/yakindu/sct/simulation/ui/view/decorator/HighlightingSubmachineDecorationProvider.java

@@ -19,8 +19,6 @@ import org.eclipse.debug.ui.DebugUITools;
 import org.eclipse.debug.ui.contexts.DebugContextEvent;
 import org.eclipse.debug.ui.contexts.IDebugContextListener;
 import org.eclipse.emf.ecore.EObject;
-import org.eclipse.emf.transaction.TransactionalEditingDomain;
-import org.eclipse.emf.workspace.util.WorkspaceSynchronizer;
 import org.eclipse.gmf.runtime.diagram.ui.services.decorator.IDecoratorTarget;
 import org.eclipse.gmf.runtime.notation.Diagram;
 import org.eclipse.jface.viewers.IStructuredSelection;