Update from chromium https://crrev.com/301725/

net/tools/quic/quic_spdy_client_stream.h

Index: net/tools/quic/quic_spdy_client_stream.h
diff --git a/net/tools/quic/quic_spdy_client_stream.h b/net/tools/quic/quic_spdy_client_stream.h
index 82741642ae5790183c216ea6daa7a346da9df086..9b5573c6903699ee77216ef0adb5ace3a89caa74 100644
--- a/net/tools/quic/quic_spdy_client_stream.h
+++ b/net/tools/quic/quic_spdy_client_stream.h
@@ -27,21 +27,21 @@ class QuicClientSession;
 class QuicSpdyClientStream : public QuicDataStream {
  public:
   QuicSpdyClientStream(QuicStreamId id, QuicClientSession* session);
-  virtual ~QuicSpdyClientStream();
+  ~QuicSpdyClientStream() override;
 
   // Override the base class to close the write side as soon as we get a
   // response.
   // SPDY/HTTP does not support bidirectional streaming.
-  virtual void OnStreamFrame(const QuicStreamFrame& frame) override;
+  void OnStreamFrame(const QuicStreamFrame& frame) override;
 
   // Override the base class to store the size of the headers.
-  virtual void OnStreamHeadersComplete(bool fin, size_t frame_len) override;
+  void OnStreamHeadersComplete(bool fin, size_t frame_len) override;
 
   // ReliableQuicStream implementation called by the session when there's
   // data for us.
-  virtual uint32 ProcessData(const char* data, uint32 data_len) override;
+  uint32 ProcessData(const char* data, uint32 data_len) override;
 
-  virtual void OnFinRead() override;
+  void OnFinRead() override;
 
   // Serializes the headers and body, sends it to the server, and
   // returns the number of bytes sent.