Avoid crashing when a BidirectionalStreamQuicImpl is deleted during OnStreamReady.

net/quic/chromium/bidirectional_stream_quic_impl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_CHROMIUM_BIDIRECTIONAL_STREAM_QUIC_IMPL_H_
 #define NET_QUIC_CHROMIUM_BIDIRECTIONAL_STREAM_QUIC_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 45 matching lines @@
   int64_t GetTotalSentBytes() const override;
   bool GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const override;
 
  private:
   // QuicChromiumClientStream::Delegate implementation:
   void OnClose() override;
   void OnError(int error) override;
 
   void OnStreamReady(int rv);
   void OnSendDataComplete(int rv);
+  void ReadInitialHeaders();
   void OnReadInitialHeadersComplete(int rv);
   void ReadTrailingHeaders();
   void OnReadTrailingHeadersComplete(int rv);
   void OnReadDataComplete(int rv);
 
   // Notifies the delegate of an error.
   void NotifyError(int error);
   // Notifies the delegate that the stream is ready.
   void NotifyStreamReady();
   // Resets the stream and ensures that |delegate_| won't be called back.
@@ skipping 46 matching lines @@
   bool send_request_headers_automatically_;
 
   base::WeakPtrFactory<BidirectionalStreamQuicImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BidirectionalStreamQuicImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CHROMIUM_BIDIRECTIONAL_STREAM_QUIC_IMPL_H_