Extract a QuicSpdyServerStreamBase class for code sharing between QuicSimpleServerStream and GfeQui…

net/quic/core/quic_spdy_stream.h

Index: net/quic/core/quic_spdy_stream.h
diff --git a/net/quic/core/quic_spdy_stream.h b/net/quic/core/quic_spdy_stream.h
index 19bcddc58925a2c77ccb305500876199a399c575..97374e53b871891bbad6cb37717134720daf48f5 100644
--- a/net/quic/core/quic_spdy_stream.h
+++ b/net/quic/core/quic_spdy_stream.h
@@ -67,9 +67,6 @@ class NET_EXPORT_PRIVATE QuicSpdyStream : public QuicStream {
   QuicSpdyStream(QuicStreamId id, QuicSpdySession* spdy_session);
   ~QuicSpdyStream() override;
 
-  // Override the base class to send QUIC_STREAM_NO_ERROR to the peer
-  // when the stream has not received all the data.
-  void CloseWriteSide() override;
   void StopReading() override;
 
   // QuicStream implementation
@@ -183,6 +180,8 @@ class NET_EXPORT_PRIVATE QuicSpdyStream : public QuicStream {
 
   bool allow_bidirectional_data() const { return allow_bidirectional_data_; }
 
+  using QuicStream::CloseWriteSide;
+
  protected:
   virtual void OnInitialHeadersComplete(bool fin,
                                         size_t frame_len,