Fix upgrade to secure issue

sdk/lib/io/secure_socket.dart

Index: sdk/lib/io/secure_socket.dart
diff --git a/sdk/lib/io/secure_socket.dart b/sdk/lib/io/secure_socket.dart
index 6874c1445baa80f83756baf70ee7261e688ae01e..9b4d4c67be48fccbe497b407607970339f2b0f72 100644
--- a/sdk/lib/io/secure_socket.dart
+++ b/sdk/lib/io/secure_socket.dart
@@ -251,6 +251,8 @@ abstract class RawSecureSocket implements RawSocket {
        bool sendClientCertificate: false,
        String certificateName,
        bool onBadCertificate(X509Certificate certificate)}) {
+    socket.readEventsEnabled = false;
+    socket.writeEventsEnabled = false;
     return  _RawSecureSocket.connect(
         host != null ? host : socket.address,
         socket.port,
@@ -290,6 +292,8 @@ abstract class RawSecureSocket implements RawSocket {
        List<int> carryOverData,
        bool requestClientCertificate: false,
        bool requireClientCertificate: false}) {
+    socket.readEventsEnabled = false;
+    socket.writeEventsEnabled = false;
     return _RawSecureSocket.connect(
         socket.remoteHost,
         socket.remotePort,