Change new List(n) to return fixed length list.

tests/language/string_test.dart

Index: tests/language/string_test.dart
diff --git a/tests/language/string_test.dart b/tests/language/string_test.dart
index 546274b226b5bf71f755fab00180a1cea9cf2ee0..bbeb91c38cccf762bc8903c243521ed4bfe3dc2c 100644
--- a/tests/language/string_test.dart
+++ b/tests/language/string_test.dart
@@ -21,7 +21,7 @@ class StringTest {
   }
 
   static testStringsJoin() {
-    List<String> a = new List<String>.fixedLength(2);
+    List<String> a = new List<String>(2);
     a[0] = "Hello";
     a[1] = "World";
     String s = a.join("*^*");