Use Element instead of Symbol.

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

 // 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;
 
 /**
  * Common supertype for most declarations. A declaration introduces a new name
  * in a scope. Certain tools, such as the IDE, need to know the location of this
  * name, but the name should otherwise be considered a part of the declaration,
  * not an independent node. So the name is not visited when traversing the AST.
  */
 public abstract class DartDeclaration<N extends DartExpression> extends DartNode {
 
   private N name; // Not visited.
   private DartComment dartDoc;
-  
+
   protected DartDeclaration(N name) {
     this.name = becomeParentOf(name);
   }
 
   public final N getName() {
     return name;
   }
 
   public final void setName(N newName) {
     name = becomeParentOf(newName);
   }
 
-  @Override
-  public abstract Element getSymbol();
-  
   public DartComment getDartDoc() {
     return dartDoc;
   }
-  
+
   public void setDartDoc(DartComment dartDoc) {
     // dartDoc is still parented by the containing DartUnit.
     this.dartDoc = dartDoc;
   }
 }