Make isEmpty a getter.

lib/compiler/implementation/scanner/keyword.dart

 // 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.
 
 /**
  * A keyword in the Dart programming language.
  */
 class Keyword implements SourceString {
   static const List<Keyword> values = const <Keyword> [
       const Keyword("assert"),
@@ skipping 97 matching lines @@
 
   String toString() => syntax;
   String slowToString() => syntax;
   String get stringValue => syntax;
 
   SourceString copyWithoutQuotes(int initial, int terminal) {
     // TODO(lrn): consider remodelling to avoid having this method in keywords.
     return this;
   }
 
-  bool isEmpty() => false;
+  bool get isEmpty => false;
   bool isPrivate() => false;
 }
 
 /**
  * Abstract state in a state machine for scanning keywords.
  */
 abstract class KeywordState {
   abstract bool isLeaf();
   abstract KeywordState next(int c);
   abstract Keyword get keyword;
@@ skipping 93 matching lines @@
   final Keyword keyword;
 
   LeafKeywordState(String syntax) : keyword = Keyword.keywords[syntax];
 
   bool isLeaf() => true;
 
   KeywordState next(int c) => null;
 
   String toString() => keyword.syntax;
 }