Revert "Bug 563236"

This reverts commit bd86ff31c64efa905de7c56952bac416cb9571dc.

undo last commit  plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/runtime/XMLConfigElement.java
diff --git a/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/runtime/XMLConfigElement.java b/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/runtime/XMLConfigElement.java
index 20d1960..e1a9b66 100644
--- a/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/runtime/XMLConfigElement.java
+++ b/plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/runtime/XMLConfigElement.java
@@ -23,6 +23,7 @@
 import org.eclipse.core.runtime.IContributor;
 import org.eclipse.core.runtime.IExtension;
 import org.eclipse.core.runtime.IPath;
+import org.eclipse.core.runtime.IPluginDescriptor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.InvalidRegistryObjectException;
 import org.eclipse.core.runtime.Path;
@@ -262,5 +263,10 @@
 			return false;
 		}
 
+		public IPluginDescriptor getDeclaringPluginDescriptor() throws InvalidRegistryObjectException {
+			// TODO Auto-generated method stub
+			return null;
+		}
+		
 	}
 }