Modify PeerConnection for end-to-end QuicDataChannel usage

webrtc/p2p/quic/quicsession.cc

Index: webrtc/p2p/quic/quicsession.cc
diff --git a/webrtc/p2p/quic/quicsession.cc b/webrtc/p2p/quic/quicsession.cc
index 281af5e3a745a254475f5c85b8d63949c8452384..37dfc7ddc84b1396f361b2ad87d9327692ccca28 100644
--- a/webrtc/p2p/quic/quicsession.cc
+++ b/webrtc/p2p/quic/quicsession.cc
@@ -75,15 +75,14 @@ ReliableQuicStream* QuicSession::CreateOutgoingDynamicStream(
     net::SpdyPriority priority) {
   ReliableQuicStream* stream = CreateDataStream(GetNextOutgoingStreamId());
   if (stream) {
-    ActivateStream(stream);
+    ActivateStream(stream);  // QuicSession owns the stream.
   }
   return stream;
 }
 
 ReliableQuicStream* QuicSession::CreateDataStream(net::QuicStreamId id) {
   if (crypto_stream_ == nullptr || !crypto_stream_->encryption_established()) {
-    // Encryption not active so no stream created
-    return nullptr;
+    return nullptr;  // Encryption not active so no stream created
   }
   return new ReliableQuicStream(id, this);
 }