Use Element instead of Symbol.

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

Index: compiler/java/com/google/dart/compiler/ast/ElementReference.java
diff --git a/compiler/java/com/google/dart/compiler/ast/ElementReference.java b/compiler/java/com/google/dart/compiler/ast/ElementReference.java
deleted file mode 100644
index 393ebc989bb2fb71d1fad77b405aaa54f684b6f2..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/ast/ElementReference.java
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright (c) 2011, 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.ast;
-
-import com.google.dart.compiler.resolver.Element;
-
-/**
- * An {@link ElementReference} is an AST node that references an element, which is
- * used to calculate its type.
- * For example, a method invocation references the {@link MethodElement} that the call
- * resolves to.
- */
-public interface ElementReference {
-  public Element getReferencedElement();
-
-  public void setReferencedElement(Element element);
-}