Update test scripts to deal with current VM behavior on optional constructor arguments.

runtime/bin/socket_stream.dart

Index: runtime/bin/socket_stream.dart
diff --git a/runtime/bin/socket_stream.dart b/runtime/bin/socket_stream.dart
index 57e6e998d235f57bb7486ed60dbef8d271d50100..e6aab3d4bb4b4ba59d6b7a9a1d7a87f8dbbb6338 100644
--- a/runtime/bin/socket_stream.dart
+++ b/runtime/bin/socket_stream.dart
@@ -56,7 +56,7 @@ class SocketOutputStream implements OutputStream {
   SocketOutputStream(Socket socket)
       : _socket = socket, _pendingWrites = new _BufferList();
 
-    bool write(List<int> buffer, [bool copyBuffer = true]) {
+  bool write(List<int> buffer, [bool copyBuffer = true]) {
     return _write(buffer, 0, buffer.length, copyBuffer);
   }