In r8605, DTLS is enabled by default for native webrtc. So we have to disable it explicitly in peerconnection example for loopback test.

BUG=4386
TEST=Manual Test
R=jiayl@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/44599004

Cr-Commit-Position: refs/heads/master@{#8677}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8677 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/examples/peerconnection/client/conductor.cc

diff --git a/talk/examples/peerconnection/client/conductor.cc b/talk/examples/peerconnection/client/conductor.cc
index 7df2090..bf0d6c9 100644
--- a/talk/examples/peerconnection/client/conductor.cc
+++ b/talk/examples/peerconnection/client/conductor.cc
@@ -140,6 +140,11 @@
     constraints.AddOptional(webrtc::MediaConstraintsInterface::kEnableDtlsSrtp,
                             "true");
   }
+  else
+  {
+    constraints.AddOptional(webrtc::MediaConstraintsInterface::kEnableDtlsSrtp,
+                            "false");
+  }
 
   peer_connection_ =
       peer_connection_factory_->CreatePeerConnection(servers,