Only use BoringSSL time callback in unit tests.

webrtc/base/sslstreamadapter.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 142 matching lines @@
 bool SSLStreamAdapter::IsAcceptableCipher(int cipher, KeyType key_type) {
   return OpenSSLStreamAdapter::IsAcceptableCipher(cipher, key_type);
 }
 bool SSLStreamAdapter::IsAcceptableCipher(const std::string& cipher,
                                           KeyType key_type) {
   return OpenSSLStreamAdapter::IsAcceptableCipher(cipher, key_type);
 }
 std::string SSLStreamAdapter::SslCipherSuiteToName(int cipher_suite) {
   return OpenSSLStreamAdapter::SslCipherSuiteToName(cipher_suite);
 }
+void SSLStreamAdapter::enable_time_callback_for_testing() {
+  OpenSSLStreamAdapter::enable_time_callback_for_testing();
+}
 #endif  // SSL_USE_OPENSSL
 
 ///////////////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc