Clarify member variable of QpackSendStream.

Adding "http3" to stream type so that it differentiates with QUIC stream type (Bidirectional/unidirectional).

gfe-relnote: v99 only, not protected.
PiperOrigin-RevId: 258806370
Change-Id: I02746a82a869367ff75da8e4f74f4b890395d9c4
diff --git a/quic/core/qpack/qpack_send_stream.h b/quic/core/qpack/qpack_send_stream.h
index 4a10e7f..526cf6d 100644
--- a/quic/core/qpack/qpack_send_stream.h
+++ b/quic/core/qpack/qpack_send_stream.h
@@ -25,7 +25,7 @@
   // this stream.
   QpackSendStream(QuicStreamId id,
                   QuicSpdySession* session,
-                  uint64_t stream_type);
+                  uint64_t http3_stream_type);
   QpackSendStream(const QpackSendStream&) = delete;
   QpackSendStream& operator=(const QpackSendStream&) = delete;
   ~QpackSendStream() override = default;
@@ -43,7 +43,7 @@
   void WriteStreamData(QuicStringPiece data) override;
 
  private:
-  const uint64_t stream_type_;
+  const uint64_t http3_stream_type_;
   bool stream_type_sent_;
 };