Change dart:io library patch for dart2js to match changes to TlsSocket.

sdk/lib/_internal/compiler/implementation/lib/io_patch.dart

Index: sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
index e06bd1886e035b9beef36f1ed2a4b7f6c19fdbea..6b6eeed2566d81f20b60b0871bad8771d9e86d79 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
@@ -168,7 +168,8 @@ patch class Socket {
 }
 
 patch class TlsSocket {
-  patch static void setCertificateDatabase(String pkcertDirectory) {
+  patch static void setCertificateDatabase(String certificateDatabase,
+                                           [String password]) {
     throw new UnsupportedError("TlsSocket.setCertificateDatabase");
   }
 }