Rolls back fix of SecurityContext method names.

tests/standalone/io/regress_21160_test.dart

Index: tests/standalone/io/regress_21160_test.dart
diff --git a/tests/standalone/io/regress_21160_test.dart b/tests/standalone/io/regress_21160_test.dart
index 25d64e8606f35fae7ce65ce82eb497b73a1f5d96..b3d39f17251b8e4975bc36f7e8a40d0a4939657a 100644
--- a/tests/standalone/io/regress_21160_test.dart
+++ b/tests/standalone/io/regress_21160_test.dart
@@ -13,12 +13,12 @@ import "dart:typed_data";
 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'));
 
 // 10 KiB of i%256 data.
 Uint8List DATA = new Uint8List.fromList(