Clean up TODOs

pkg/analysis_server/test/services/completion/statement/statement_completion_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.
 
 library test.services.completion.statement;
 
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/completion/statement/statement_completion.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:test/test.dart';
@@ skipping 199 matching lines @@
 main() {
   for (int i = 0;) {
   }
 }
 ''',
         atEnd: true);
     _assertHasChange(
         'Complete for-statement',
         '''
 main() {
-  for (int i = 0; ) {
+  for (int i = 0; ; ) {
   }
 }
 ''',
         (s) => _after(s, '0; '));
   }
 
   test_emptyInitializers() async {
     await _prepareCompletion(
         '}',
         '''
@@ skipping 662 matching lines @@
         '''
 main() {
   while () {
     ////
   }
 }
 ''',
         (s) => _after(s, 'while ('));
   }
 }