Migrate test block 8 to Dart 2.0.

tests/corelib_2/growable_list_test.dart

Index: tests/corelib_2/growable_list_test.dart
diff --git a/tests/corelib_strong/growable_list_test.dart b/tests/corelib_2/growable_list_test.dart
similarity index 95%
rename from tests/corelib_strong/growable_list_test.dart
rename to tests/corelib_2/growable_list_test.dart
index 2aa5b6fa6f761c40969dc6e326a4fd8f1a95d507..355d9cc60ef530dd35c6268b3325a1701fb15d10 100644
--- a/tests/corelib_strong/growable_list_test.dart
+++ b/tests/corelib_2/growable_list_test.dart
@@ -8,11 +8,8 @@ import "package:expect/expect.dart";
 
 void main() {
   testConstructor();
-
-  bool checked = false;
-  assert((checked = true));
   // Concurrent modification checks are only guaranteed in checked mode.
-  if (checked) testConcurrentModification();
+  testConcurrentModification();
 }
 
 // Iterable generating numbers in range [0..count).
@@ -33,7 +30,7 @@ class TestIterable extends TestIterableBase {
   int get length => throw "SHOULD NOT BE CALLED";
 }
 
-// Implement Set for private EfficientLength interface.
+// Implement Set for private EfficientLengthIterable interface.
 class EfficientTestIterable extends TestIterableBase implements Set<int> {
   EfficientTestIterable(length, count, [callbackIndex = -1, callback])
       : super(length, count, callbackIndex, callback);
@@ -108,7 +105,7 @@ void testConstructor() {
 }
 
 void testConcurrentModification() {
-  // Without EfficientLength interface
+  // Without EfficientLengthIterable interface
   {
     // Change length of list after 200 additions.
     var l = [];
@@ -131,7 +128,7 @@ void testConcurrentModification() {
     }, (e) => e is ConcurrentModificationError, "cm2");
   }
 
-  // With EfficientLength interface (uses length).
+  // With EfficientLengthIterable interface (uses length).
   {
     // Change length of list after 20 additions.
     var l = [];