Call SSL_shutdown in OpenSSLStreamAdapter::Cleanup.

BUG=crbug/414211
R=juberti@webrtc.org

Committed: https://code.google.com/p/webrtc/source/detail?r=7293

Review URL: https://webrtc-codereview.appspot.com/22739004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7301 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/base/opensslstreamadapter.cc b/webrtc/base/opensslstreamadapter.cc
index 070a948..133eb72 100644
--- a/webrtc/base/opensslstreamadapter.cc
+++ b/webrtc/base/opensslstreamadapter.cc
@@ -695,6 +695,12 @@
   }
 
   if (ssl_) {
+    int ret = SSL_shutdown(ssl_);
+    if (ret < 0) {
+      LOG(LS_WARNING) << "SSL_shutdown failed, error = "
+                      << SSL_get_error(ssl_, ret);
+    }
+
     SSL_free(ssl_);
     ssl_ = NULL;
   }