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

webrtc/base/sslstreamadapter.cc

Index: webrtc/base/sslstreamadapter.cc
diff --git a/webrtc/base/sslstreamadapter.cc b/webrtc/base/sslstreamadapter.cc
index e0fce3ad2f2642090e818a963972e03e1712317d..44158d401f984862aba07ce0cc24773f0b6c35ff 100644
--- a/webrtc/base/sslstreamadapter.cc
+++ b/webrtc/base/sslstreamadapter.cc
@@ -82,6 +82,9 @@ bool SSLStreamAdapter::HaveDtlsSrtp() {
 bool SSLStreamAdapter::HaveExporter() {
   return OpenSSLStreamAdapter::HaveExporter();
 }
+bool SSLStreamAdapter::IsBoringSsl() {
+  return OpenSSLStreamAdapter::IsBoringSsl();
+}
 bool SSLStreamAdapter::IsAcceptableCipher(int cipher, KeyType key_type) {
   return OpenSSLStreamAdapter::IsAcceptableCipher(cipher, key_type);
 }