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

runtime/bin/secure_socket.h

Index: runtime/bin/secure_socket.h
diff --git a/runtime/bin/secure_socket.h b/runtime/bin/secure_socket.h
index 22ef7dcc817bd98df719cc3f9b68b1054508ab95..a8e0a39a3a97bdf197a6b26283da1e8f66722689 100644
--- a/runtime/bin/secure_socket.h
+++ b/runtime/bin/secure_socket.h
@@ -77,7 +77,8 @@ class SSLFilter {
   void Handshake();
   void RegisterHandshakeCompleteCallback(Dart_Handle handshake_complete);
   static void InitializeLibrary(const char* certificate_database,
-                                const char* password);
+                                const char* password,
+                                bool use_builtin_root_certificates);
 
   intptr_t ProcessBuffer(int bufferIndex);