Adds SecurityContext.usePrivateKeyBytes

tests/standalone/io/secure_socket_renegotiate_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 client certificates work, if the client and server
 // are in separate processes, and that connection renegotiation works, and
 // can request a client certificate to be sent.
 
 import "dart:async";
 import "dart:convert";
 import "dart:io";
 
 import "package:expect/expect.dart";
 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');
+  ..usePrivateKeyAsBytes(readLocalFile('certificates/server_key.pem'),
+                         password: 'dartdart');
 
 Future<SecureServerSocket> runServer() {
   return SecureServerSocket.bind(HOST_NAME, 0, serverContext)
     .then((SecureServerSocket server) {
       server.listen((SecureSocket socket) {
         Expect.isNull(socket.peerCertificate);
 
         StreamIterator<String> input =
             new StreamIterator(socket.transform(UTF8.decoder)
                                      .transform(new LineSplitter()));
@@ skipping 41 matching lines @@
           if (result.exitCode != 0) {
             print("Client failed, stdout:");
             print(result.stdout);
             print("  stderr:");
             print(result.stderr);
             Expect.fail('Client subprocess exit code: ${result.exitCode}');
           }
         });
     });
 }