Ensure that there is no "hidden" DNS lookup in secure socket code

runtime/bin/socket_patch.dart

Index: runtime/bin/socket_patch.dart
diff --git a/runtime/bin/socket_patch.dart b/runtime/bin/socket_patch.dart
index e69dfedbb752b5e8f33a6e3a6b2b26dbce05f838..d9886117023cf22f8eee06128db1f09f727474c6 100644
--- a/runtime/bin/socket_patch.dart
+++ b/runtime/bin/socket_patch.dart
@@ -88,6 +88,12 @@ class _InternetAddress implements InternetAddress {
     }
   }
 
+  // Create a clone of this _InternetAddress replacing the host.
+  _InternetAddress _cloneWithNewHost(String host) {
+    return new _InternetAddress(
+        type, address, host, new Uint8List.fromList(_sockaddr_storage));
+  }
+
   String toString() {
     return "InternetAddress('$address', ${type.name})";
   }