Adds SecurityContext.usePrivateKeyBytes

tests/standalone/io/secure_socket_renegotiate_test.dart

Index: tests/standalone/io/secure_socket_renegotiate_test.dart
diff --git a/tests/standalone/io/secure_socket_renegotiate_test.dart b/tests/standalone/io/secure_socket_renegotiate_test.dart
index 457cee63625acca1f018667ff615d15aa01d2541..23105e06f9d43c0f301749ec3c14871999994df5 100644
--- a/tests/standalone/io/secure_socket_renegotiate_test.dart
+++ b/tests/standalone/io/secure_socket_renegotiate_test.dart
@@ -15,11 +15,12 @@ import "package:path/path.dart";
 
 const HOST_NAME = "localhost";
 String localFile(path) => Platform.script.resolve(path).toFilePath();
+List<int> readLocalFile(path) => (new File(localFile(path))).readAsBytesSync();
 
 SecurityContext serverContext = new SecurityContext()
   ..useCertificateChain(localFile('certificates/server_chain.pem'))
-  ..usePrivateKey(localFile('certificates/server_key.pem'),
-                  password: 'dartdart');
+  ..usePrivateKeyBytes(readLocalFile('certificates/server_key.pem'),
+                       password: 'dartdart');
 
 Future<SecureServerSocket> runServer() {
   return SecureServerSocket.bind(HOST_NAME, 0, serverContext)