Use NodeElement to access Node in Resolver

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 package com.google.dart.compiler.resolver;
 
 import com.google.dart.compiler.ast.DartNode;
 import com.google.dart.compiler.type.Type;
 
 /**
  * Extension of {@link FieldElement} which is base of {@link DartNode} and is modifiable.
  */
 public interface FieldNodeElement extends FieldElement, NodeElement {
   /**
    * Sets the inferred type of this constant.
    * 
    * @param type the {@link Type} to set, not <code>null</code>.
    */
   void setConstantType(Type type);
+  
+  MethodNodeElement getGetter();
+  
+  MethodNodeElement getSetter();
 }