Revert of Change initial DTLS retransmission timer from 1 second to 50ms.

webrtc/base/opensslstreamadapter.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 753 matching lines @@
 
   ssl_ = SSL_new(ssl_ctx_);
   if (!ssl_) {
     BIO_free(bio);
     return -1;
   }
 
   SSL_set_app_data(ssl_, this);
 
   SSL_set_bio(ssl_, bio, bio);  // the SSL object owns the bio now.
+#ifndef OPENSSL_IS_BORINGSSL
   if (ssl_mode_ == SSL_MODE_DTLS) {
-#ifdef OPENSSL_IS_BORINGSSL
-    // Change the initial retransmission timer from 1 second to 50ms.
-    // This will likely result in some spurious retransmissions, but
-    // it's useful for ensuring a timely handshake when there's packet
-    // loss.
-    DTLSv1_set_initial_timeout_duration(ssl_, 50);
-#else
     // Enable read-ahead for DTLS so whole packets are read from internal BIO
     // before parsing. This is done internally by BoringSSL for DTLS.
     SSL_set_read_ahead(ssl_, 1);
+  }
 #endif
-  }
 
   SSL_set_mode(ssl_, SSL_MODE_ENABLE_PARTIAL_WRITE |
                SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
 
 #if !defined(OPENSSL_IS_BORINGSSL)
   // Specify an ECDH group for ECDHE ciphers, otherwise OpenSSL cannot
   // negotiate them when acting as the server. Use NIST's P-256 which is
   // commonly supported. BoringSSL doesn't need explicit configuration and has
   // a reasonable default set.
   EC_KEY* ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
@@ skipping 402 matching lines @@
         return true;
     }
   }
 
   return false;
 }
 
 }  // namespace rtc
 
 #endif  // HAVE_OPENSSL_SSL_H