Fix hints in kernel (TBR)

pkg/kernel/test/class_hierarchy_self_check.dart

 // Copyright (c) 2016, 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 'package:kernel/kernel.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:test/test.dart';
 import 'class_hierarchy_basic.dart';
 import 'dart:io';
 import 'dart:math';
@@ skipping 133 matching lines @@
       }
     }
   }
   if (verbose) {
     print('\rProgress 100%. Done.');
   }
 }
 
 var random = new Random(12345);
 
-List/*<T>*/ pickRandom/*<T>*/(List/*<T>*/ items, int n) {
-  var result = /*<T>*/ [];
+List<T> pickRandom<T>(List<T> items, int n) {
+  var result = <T>[];
   for (int i = 0; i < n; ++i) {
     result.add(items[random.nextInt(items.length)]);
   }
   return result;
 }