Fix shadowing in tests. Constructor and method are not allowed to have

tests/standalone/io/stream_pipe_test.dart

Index: tests/standalone/io/stream_pipe_test.dart
diff --git a/tests/standalone/io/stream_pipe_test.dart b/tests/standalone/io/stream_pipe_test.dart
index 6f77e4650c3ae065a8da983b63b5bf39da104b53..22b7facde03d5e5ed27130278443d01afe0ca790 100644
--- a/tests/standalone/io/stream_pipe_test.dart
+++ b/tests/standalone/io/stream_pipe_test.dart
@@ -69,7 +69,7 @@ class PipeServerGame {
         _sendPort = null,
         _messages = 0 {
     _sendPort = spawnFunction(startPipeServer);
-    start();
+    initialize();
   }
 
   void runTest() {
@@ -124,7 +124,7 @@ class PipeServerGame {
     }
   }
 
-  void start() {
+  void initialize() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       runTest();