fix missing digit error translation

pkg/front_end/test/scanner_replacement_test.dart

 // Copyright (c) 2017, 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:convert' show UTF8;
 
 import 'package:front_end/src/fasta/scanner/precedence.dart'
     show BAD_INPUT_INFO, EOF_INFO;
 import 'package:front_end/src/fasta/scanner/recover.dart'
     show defaultRecoveryStrategy;
@@ skipping 78 matching lines @@
   @override
   @failingTest
   void test_comment_generic_method_type_list() {
     // TODO(paulberry,ahe): Fasta scanner doesn't support generic comment
     // syntax.
     super.test_comment_generic_method_type_list();
   }
 
   @override
   @failingTest
-  void test_double_missingDigitInExponent() {
-    // TODO(danrubel): investigate and fix
-    super.test_double_missingDigitInExponent();
-  }
-
-  @override
-  @failingTest
-  void test_hexidecimal_missingDigit() {
-    // TODO(danrubel): investigate and fix
-    super.test_hexidecimal_missingDigit();
-  }
-
-  @override
-  @failingTest
   void test_mismatched_closer() {
     // TODO(danrubel): investigate and fix
     super.test_mismatched_closer();
   }
 
   @override
   @failingTest
   void test_mismatched_opener() {
     // TODO(danrubel): investigate and fix
     super.test_mismatched_opener();
@@ skipping 149 matching lines @@
     expect(previous.previous, previous, reason: 'Invalid leading EOF');
     while (!token.isEof) {
       previous = token;
       token = token.next;
       expect(token, isNotNull, reason: previous.toString());
       expect(token.previous, previous, reason: token.toString());
     }
     expect(token.next, token, reason: 'Invalid trailing EOF');
   }
 }