Fix hints in kernel (TBR)

pkg/kernel/test/class_hierarchy_self_check.dart

Index: pkg/kernel/test/class_hierarchy_self_check.dart
diff --git a/pkg/kernel/test/class_hierarchy_self_check.dart b/pkg/kernel/test/class_hierarchy_self_check.dart
index f9edbc8bc55990e1b4bf7ef0d0a3d413ab07024c..4fe7e3f3f39e9dd87f9d51b28f051892377add23 100644
--- a/pkg/kernel/test/class_hierarchy_self_check.dart
+++ b/pkg/kernel/test/class_hierarchy_self_check.dart
@@ -151,8 +151,8 @@ void testClassHierarchyOnProgram(Program program, {bool verbose: false}) {
 
 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)]);
   }