[dart:io] Eagerly deallocate SSLFilter internals

runtime/bin/secure_socket_boringssl.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_BIN_SECURE_SOCKET_BORINGSSL_H_
 #define RUNTIME_BIN_SECURE_SOCKET_BORINGSSL_H_
 
 #if !defined(RUNTIME_BIN_SECURE_SOCKET_H_)
 #error Do not include secure_socket_boringssl.h directly. Use secure_socket.h.
 #endif
@@ skipping 88 matching lines @@
   ~SSLFilter();
 
   Dart_Handle Init(Dart_Handle dart_this);
   void Connect(const char* hostname,
                SSL_CTX* context,
                bool is_server,
                bool request_client_certificate,
                bool require_client_certificate,
                Dart_Handle protocols_handle);
   void Destroy();
+  void FreeResources();
   void Handshake();
   void GetSelectedProtocol(Dart_NativeArguments args);
   void Renegotiate(bool use_session_cache,
                    bool request_client_certificate,
                    bool require_client_certificate);
   void RegisterHandshakeCompleteCallback(Dart_Handle handshake_complete);
   void RegisterBadCertificateCallback(Dart_Handle callback);
   Dart_Handle bad_certificate_callback() {
     return Dart_HandleFromPersistent(bad_certificate_callback_);
   }
@@ skipping 40 matching lines @@
   Dart_Handle InitializeBuffers(Dart_Handle dart_this);
   void InitializePlatformData();
 
   DISALLOW_COPY_AND_ASSIGN(SSLFilter);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_SECURE_SOCKET_BORINGSSL_H_