cleanup TokenType var names

pkg/compiler/lib/src/tree/nodes.dart

 // 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.
 
 import 'dart:collection' show IterableMixin;
 
 import 'package:front_end/src/fasta/fasta_codes.dart' show FastaMessage;
 import 'package:front_end/src/fasta/scanner.dart' show BeginGroupToken, Token;
 import 'package:front_end/src/fasta/scanner/token_constants.dart' as Tokens
     show PLUS_TOKEN;
@@ skipping 1509 matching lines @@
   final Token beginToken;
   final Token endToken;
 
   Return(this.beginToken, this.endToken, this.expression);
 
   Return asReturn() => this;
 
   bool get hasExpression => expression != null;
 
   /// `true` if this return is of the form `=> e;`.
-  bool get isArrowBody => beginToken.info == TokenType.FUNCTION;
+  bool get isArrowBody => beginToken.type == TokenType.FUNCTION;
 
   accept(Visitor visitor) => visitor.visitReturn(this);
 
   accept1(Visitor1 visitor, arg) => visitor.visitReturn(this, arg);
 
   visitChildren(Visitor visitor) {
     if (expression != null) expression.accept(visitor);
   }
 
   visitChildren1(Visitor1 visitor, arg) {
@@ skipping 1737 matching lines @@
  */
 Object getTreeElement(TreeElementMixin node) => node._element;
 
 /**
  * Do not call this method directly.  Instead, use an instance of
  * TreeElements.
  */
 void setTreeElement(TreeElementMixin node, Object value) {
   node._element = value;
 }