flatten Keyword into TokenType

pkg/front_end/lib/src/fasta/parser/parser.dart

Index: pkg/front_end/lib/src/fasta/parser/parser.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/parser.dart b/pkg/front_end/lib/src/fasta/parser/parser.dart
index c9fad0e3f8b0b786003f488f22d68481d146dceb..6554e591083331bb48d8093cdd085e08944f7659 100644
--- a/pkg/front_end/lib/src/fasta/parser/parser.dart
+++ b/pkg/front_end/lib/src/fasta/parser/parser.dart
@@ -805,7 +805,7 @@ class Parser {
     if (identical(kind, IDENTIFIER_TOKEN)) return true;
     if (identical(kind, KEYWORD_TOKEN)) {
       Keyword keyword = (token as KeywordToken).keyword;
-      String value = keyword.syntax;
+      String value = keyword.lexeme;
       return keyword.isPseudo ||
           (identical(value, 'dynamic')) ||
           (identical(value, 'void'));