Break out the basic reliable QUIC stream functionality from the

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 5e2bf70dcd4ebb6bbe9002fdd5fb6044b47780a5..af12b8b222b2562ab54804d4bde6fdbf384f33a8 100644
--- a/net/quic/quic_reliable_client_stream.cc
+++ b/net/quic/quic_reliable_client_stream.cc
@@ -14,7 +14,7 @@ namespace net {
 QuicReliableClientStream::QuicReliableClientStream(QuicStreamId id,
                                                    QuicSession* session,
                                                    const BoundNetLog& net_log)
-    : ReliableQuicStream(id, session),
+    : QuicDataStream(id, session),
       net_log_(net_log),
       delegate_(NULL) {
 }
@@ -57,7 +57,7 @@ void QuicReliableClientStream::OnCanWrite() {
 
 QuicPriority QuicReliableClientStream::EffectivePriority() const {
   if (delegate_ && delegate_->HasSendHeadersComplete()) {
-    return ReliableQuicStream::EffectivePriority();
+    return QuicDataStream::EffectivePriority();
   }
   return kHighestPriority;
 }