Use Element instead of Symbol.

compiler/java/com/google/dart/compiler/common/HasSymbol.java

Index: compiler/java/com/google/dart/compiler/common/HasSymbol.java
diff --git a/compiler/java/com/google/dart/compiler/common/HasSymbol.java b/compiler/java/com/google/dart/compiler/common/HasSymbol.java
deleted file mode 100644
index 0128679bed19d954f40cd4e06810c0b2801f5436..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/common/HasSymbol.java
+++ /dev/null
@@ -1,16 +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.common;
-
-/**
- * @author johnlenz@google.com (John Lenz)
- */
-public interface HasSymbol {
-  /**
-   * @return Return the original user visible name for a Object represented
-   * in a source map.
-   */
-  Symbol getSymbol();
-}