Adds SecurityContext.usePrivateKeyBytes

tests/standalone/io/secure_bad_certificate_test.dart

 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // This test verifies that the bad certificate callback works.
 
 import "dart:async";
 import "dart:io";
 
 import "package:expect/expect.dart";
 
 final 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');
 
 class CustomException {}
 
 main() async {
   var HOST = (await InternetAddress.lookup(HOST_NAME)).first;
   var server = await SecureServerSocket.bind(HOST_NAME, 0, serverContext);
   server.listen((SecureSocket socket) {
       socket.listen((_) {}, onDone: () {
         socket.close();
       });
@@ skipping 44 matching lines @@
     if (error is ExpectException) rethrow;
     Expect.notEquals(result, 'pass');
     if (result == 'fail') {
       Expect.isTrue(error is HandshakeException || error is ArgumentError);
     } else if (result == 'throw') {
       Expect.isTrue(error is CustomException);
     } else {
       Expect.fail('Unknown expectation $result');
     }
   }
-}
+}