Rolls back fix of SecurityContext method names.

tests/standalone/io/http_proxy_advanced_test.dart

Index: tests/standalone/io/http_proxy_advanced_test.dart
diff --git a/tests/standalone/io/http_proxy_advanced_test.dart b/tests/standalone/io/http_proxy_advanced_test.dart
index 81a43c9ebb139a6e2e1b26f66097112f506c8ac7..1d2e585ee1d92f509818883049eb3d75de939f1b 100644
--- a/tests/standalone/io/http_proxy_advanced_test.dart
+++ b/tests/standalone/io/http_proxy_advanced_test.dart
@@ -12,12 +12,12 @@ import 'dart:convert';
 String localFile(path) => Platform.script.resolve(path).toFilePath();
 
 SecurityContext serverContext = new SecurityContext()
-  ..useCertificateChainSync(localFile('certificates/server_chain.pem'))
-  ..usePrivateKeySync(localFile('certificates/server_key.pem'),
-                      password: 'dartdart');
+  ..useCertificateChain(localFile('certificates/server_chain.pem'))
+  ..usePrivateKey(localFile('certificates/server_key.pem'),
+                  password: 'dartdart');
 
 SecurityContext clientContext = new SecurityContext()
-  ..setTrustedCertificatesSync(localFile('certificates/trusted_certs.pem'));
+  ..setTrustedCertificates(localFile('certificates/trusted_certs.pem'));
 
 class Server {
   HttpServer server;