Fix bug in net/quic/quic_reliable_client_stream.cc found by pkastings.

net/quic/quic_reliable_client_stream.cc

Index: net/quic/quic_reliable_client_stream.cc
diff --git a/net/quic/quic_reliable_client_stream.cc b/net/quic/quic_reliable_client_stream.cc
index 4eb74d6a31d8382e50b1f3678e318786a8684ac7..79397bc58cb92feccc2f9fae721706927794e3d2 100644
--- a/net/quic/quic_reliable_client_stream.cc
+++ b/net/quic/quic_reliable_client_stream.cc
@@ -27,8 +27,11 @@ QuicReliableClientStream::~QuicReliableClientStream() {
 uint32 QuicReliableClientStream::ProcessData(const char* data,
                                              uint32 data_len) {
   // TODO(rch): buffer data if we don't have a delegate.
-  if (!delegate_)
-    return ERR_ABORTED;
+  if (!delegate_) {
+    DLOG(ERROR) << "Missing delegate";
+    Reset(QUIC_STREAM_CANCELLED);
+    return 0;
+  }
 
   int rv = delegate_->OnDataReceived(data, data_len);
   if (rv != OK) {