Use Element instead of Symbol.

compiler/java/com/google/dart/compiler/ast/DartField.java

Index: compiler/java/com/google/dart/compiler/ast/DartField.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartField.java b/compiler/java/com/google/dart/compiler/ast/DartField.java
index 10108a49234740770c20e31d7a541449991eb471..70f88482a9420aad653aacb4b1f6185b59b61295 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartField.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartField.java
@@ -4,7 +4,7 @@
 
 package com.google.dart.compiler.ast;
 
-import com.google.dart.compiler.common.Symbol;
+import com.google.dart.compiler.resolver.Element;
 import com.google.dart.compiler.resolver.FieldElement;
 
 /**
@@ -40,13 +40,13 @@ public class DartField extends DartClassMember<DartIdentifier> {
   }
 
   @Override
-  public FieldElement getSymbol() {
+  public FieldElement getElement() {
     return element;
   }
 
   @Override
-  public void setSymbol(Symbol symbol) {
-    this.element = (FieldElement) symbol;
+  public void setElement(Element element) {
+    this.element = (FieldElement) element;
   }
 
   @Override