Add built-in root certificates to dart:io SecureSocket.

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 a253935b996c1629b7ff9ce0f51941da7b85d951..97330fb026ef2ffebec476d3b6e0c732e35c36bf 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/io_patch.dart
@@ -169,7 +169,8 @@ patch class Socket {
 
 patch class SecureSocket {
   patch static void setCertificateDatabase(String certificateDatabase,
-                                           [String password]) {
+                                          {String password,
+                                           bool useBuiltinRoots}) {
     throw new UnsupportedError("SecureSocket.setCertificateDatabase");
   }
 }