Adds SecurityContext.usePrivateKeyBytes

tests/standalone/io/raw_secure_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 "package:expect/expect.dart";
 import "package:path/path.dart";
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
 
 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'));
 
 main() async {
   List<int> message = "GET / HTTP/1.0\r\nHost: localhost\r\n\r\n".codeUnits;
   int written = 0;
   List<int> body = <int>[];
   var server = await HttpServer.bindSecure(
       "localhost",
@@ skipping 32 matching lines @@
         server.close();
         break;
       default: throw "Unexpected event $event";
     }
   }, onError: (e, trace) {
     String msg = "onError handler of RawSecureSocket stream hit $e";
     if (trace != null) msg += "\nStackTrace: $trace";
     Expect.fail(msg);
   });
 }