Use Element instead of Symbol.

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

Index: compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java b/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
index 98c8e1fa42e0b4ccc75afdf45a862660955f2e4f..7afc5762de613afe24f792ddf583afa068ad6981 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartBinaryExpression.java
@@ -6,16 +6,17 @@ package com.google.dart.compiler.ast;
 
 import com.google.dart.compiler.parser.Token;
 import com.google.dart.compiler.resolver.Element;
+import com.google.dart.compiler.resolver.MethodElement;
 
 /**
  * Represents a Dart binary expression.
  */
-public class DartBinaryExpression extends DartExpression implements ElementReference {
+public class DartBinaryExpression extends DartExpression {
 
   private final Token op;
   private DartExpression arg1;
   private DartExpression arg2;
-  private Element referencedElement;
+  private MethodElement element;
 
   public DartBinaryExpression(Token op, DartExpression arg1, DartExpression arg2) {
     assert op.isBinaryOperator() : op;
@@ -49,12 +50,12 @@ public class DartBinaryExpression extends DartExpression implements ElementRefer
   }
 
   @Override
-  public Element getReferencedElement() {
-    return referencedElement;
+  public MethodElement getElement() {
+    return element;
   }
 
   @Override
-  public void setReferencedElement(Element referencedElement) {
-    this.referencedElement = referencedElement;
+  public void setElement(Element element) {
+    this.element = (MethodElement) element;
   }
 }