fix missed rename fasta.Token.value --> lexeme

pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart

Index: pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
diff --git a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
index 06524b3ba5bcb6384beec777c721cf12ea5cd0c0..15f7afd0be5cc0cf8a22bfc9e0bf8dadcd030eeb 100644
--- a/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
+++ b/pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart
@@ -110,7 +110,7 @@ abstract class TokenStreamRewriterTest {
       if (setPrevious) token.previousToken = head;
       head = token;
     }
-    int eofOffset = head.charOffset + head.value.length;
+    int eofOffset = head.charOffset + head.lexeme.length;
     if (eofOffset < 0) eofOffset = 0;
     Token eof = new SymbolToken(EOF_INFO, eofOffset);
     head.next = eof;