Fix some strong mode issues.

test/class_hierarchy_tester.dart

Index: test/class_hierarchy_tester.dart
diff --git a/test/class_hierarchy_tester.dart b/test/class_hierarchy_tester.dart
index 0b2eb814d00474ddce0437cd1ac8be973cb8380d..d4e04ad95f84a0d460d1a347e6ba0ee8b5e3b2ab 100644
--- a/test/class_hierarchy_tester.dart
+++ b/test/class_hierarchy_tester.dart
@@ -52,7 +52,7 @@ void testClassHierarchyOnProgram(Program program, {bool verbose: false}) {
   List<Name> nameList = names.toList();
   progress = 0;
   for (var classNode in classHierarchy.classes) {
-    Iterable<Name> candidateNames = [
+    Iterable<Name> candidateNames = <Iterable<Name>>[
       basic.gettersAndCalls[classNode].keys,
       basic.setters[classNode].keys,
       pickRandom(nameList, 100)
@@ -141,8 +141,8 @@ void testClassHierarchyOnProgram(Program program, {bool verbose: false}) {
 
 var random = new Random(12345);
 
-List pickRandom(List items, int n) {
-  var result = [];
+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)]);
   }