cleanup. remove useless method update from actionGroup

platform/editor-ui-api/src/com/intellij/openapi/actionSystem/ActionGroup.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2015 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -85,11 +85,6 @@ public abstract class ActionGroup extends AnAction {
   public void actionPerformed(AnActionEvent e){
   }
 
-  @Override
-  public void update(AnActionEvent e) {
-    super.update(e);
-  }
-
   /**
    * @return true if {@link #actionPerformed(AnActionEvent)} should be called
    */