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

tests/standalone/io/raw_socket_write_destroy_test.dart

Index: tests/standalone/io/raw_socket_write_destroy_test.dart
diff --git a/tests/standalone/io/raw_socket_write_destroy_test.dart b/tests/standalone/io/raw_socket_write_destroy_test.dart
index b5e558a8433d8130445818577eec07c89ef0a90c..d7dc0d841988d2fdc1462cae4a815b6004189f66 100644
--- a/tests/standalone/io/raw_socket_write_destroy_test.dart
+++ b/tests/standalone/io/raw_socket_write_destroy_test.dart
@@ -18,7 +18,7 @@ void testWriteDestroyServer() {
     server.listen((socket) {
       socket.writeEventsEnabled = false;
 
-      var buffer = new List.fixedLength(WROTE, fill: 0);
+      var buffer = new List.filled(WROTE, 0);
       int offset = 0;
       void write() {
         int n = socket.write(buffer, offset, buffer.length - offset);
@@ -69,7 +69,7 @@ void testWriteDestroyClient() {
     RawSocket.connect(SERVER_ADDRESS, server.port).then((socket) {
       socket.writeEventsEnabled = false;
 
-      var buffer = new List.fixedLength(WROTE, fill: 0);
+      var buffer = new List.filled(WROTE, 0);
       int offset = 0;
       void write() {
         int n = socket.write(buffer, offset, buffer.length - offset);
@@ -93,4 +93,4 @@ void testWriteDestroyClient() {
 void main() {
   testWriteDestroyServer();
   testWriteDestroyClient();
-}
+}