Revert of Removing #defines previously used for building without BoringSSL/OpenSSL.

webrtc/base/sslstreamadapter.cc

Index: webrtc/base/sslstreamadapter.cc
diff --git a/webrtc/base/sslstreamadapter.cc b/webrtc/base/sslstreamadapter.cc
index 2f601c625791b4ee1f152bf7a39b33ab62bc7f2e..c3ef3bc3aefa5e39ab4792f7d3f767a972cb8dcb 100644
--- a/webrtc/base/sslstreamadapter.cc
+++ b/webrtc/base/sslstreamadapter.cc
@@ -9,8 +9,13 @@
  */
 
 #include "webrtc/base/sslstreamadapter.h"
+#include "webrtc/base/sslconfig.h"
+
+#if SSL_USE_OPENSSL
 
 #include "webrtc/base/opensslstreamadapter.h"
+
+#endif  // SSL_USE_OPENSSL
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -96,7 +101,11 @@
 }
 
 SSLStreamAdapter* SSLStreamAdapter::Create(StreamInterface* stream) {
+#if SSL_USE_OPENSSL
   return new OpenSSLStreamAdapter(stream);
+#else  // !SSL_USE_OPENSSL
+  return NULL;
+#endif  // SSL_USE_OPENSSL
 }
 
 SSLStreamAdapter::SSLStreamAdapter(StreamInterface* stream)
@@ -128,6 +137,16 @@
   return false;
 }
 
+#if SSL_USE_OPENSSL
+bool SSLStreamAdapter::HaveDtls() {
+  return OpenSSLStreamAdapter::HaveDtls();
+}
+bool SSLStreamAdapter::HaveDtlsSrtp() {
+  return OpenSSLStreamAdapter::HaveDtlsSrtp();
+}
+bool SSLStreamAdapter::HaveExporter() {
+  return OpenSSLStreamAdapter::HaveExporter();
+}
 bool SSLStreamAdapter::IsBoringSsl() {
   return OpenSSLStreamAdapter::IsBoringSsl();
 }
@@ -144,6 +163,7 @@
 void SSLStreamAdapter::enable_time_callback_for_testing() {
   OpenSSLStreamAdapter::enable_time_callback_for_testing();
 }
+#endif  // SSL_USE_OPENSSL
 
 ///////////////////////////////////////////////////////////////////////////////