Adds SecurityContext.usePrivateKeyBytes

tests/standalone/io/secure_server_socket_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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "dart:async";
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
 InternetAddress HOST;
 
 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');
 
 SecurityContext clientContext = new SecurityContext()
   ..setTrustedCertificates(file: localFile('certificates/trusted_certs.pem'));
 
 void testSimpleBind() {
   asyncStart();
   SecureServerSocket.bind(HOST, 0, serverContext).then((s) {
     Expect.isTrue(s.port > 0);
     s.close();
     asyncEnd();
@@ skipping 198 matching lines @@
       for (bool cancelOnError in [true, false]) {
         if (server == null || client == null) {
           testSimpleConnectFail(server, client, cancelOnError);
         }
       }
     }
   }
   testServerListenAfterConnect();
   testSimpleReadWrite();
 }