Issue 5255. Remember 'overridden' for getters/setters and fields

compiler/java/com/google/dart/compiler/resolver/Elements.java

Index: compiler/java/com/google/dart/compiler/resolver/Elements.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Elements.java b/compiler/java/com/google/dart/compiler/resolver/Elements.java
index 13ecfe35328da40ff7291060d8eb1af484fedb10..b6dc0343c94f43077bf46360cb6a7c26980d0ae4 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Elements.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Elements.java
@@ -198,8 +198,13 @@ public class Elements {
     ((AbstractNodeElement) element).setType(type);
   }
 
-  public static void setOverridden(MethodElement methodElement, Set<Element> overridden) {
-    ((MethodElementImplementation) methodElement).setOverridden(overridden);
+  public static void setOverridden(Element element, Set<Element> overridden) {
+    if (element instanceof MethodElementImplementation) {
+      ((MethodElementImplementation) element).setOverridden(overridden);
+    }
+    if (element instanceof FieldElementImplementation) {
+      ((FieldElementImplementation) element).setOverridden(overridden);
+    }
   }
 
 static FieldElementImplementation fieldFromNode(DartField node,