Remove QuicChromiumClientStream::Delegate in favor of async methods.

net/quic/chromium/bidirectional_stream_quic_impl.h

Index: net/quic/chromium/bidirectional_stream_quic_impl.h
diff --git a/net/quic/chromium/bidirectional_stream_quic_impl.h b/net/quic/chromium/bidirectional_stream_quic_impl.h
index d65f1a93ba97b2aeadf5e7678138f8c04d78cae8..07902830bb8a2a862234a7c7ad2407f34523e7db 100644
--- a/net/quic/chromium/bidirectional_stream_quic_impl.h
+++ b/net/quic/chromium/bidirectional_stream_quic_impl.h
@@ -29,8 +29,7 @@ struct BidirectionalStreamRequestInfo;
 class IOBuffer;
 
 class NET_EXPORT_PRIVATE BidirectionalStreamQuicImpl
-    : public BidirectionalStreamImpl,
-      public QuicChromiumClientStream::Delegate {
+    : public BidirectionalStreamImpl {
  public:
   explicit BidirectionalStreamQuicImpl(
       std::unique_ptr<QuicChromiumClientSession::Handle> session);
@@ -57,14 +56,7 @@ class NET_EXPORT_PRIVATE BidirectionalStreamQuicImpl
   bool GetLoadTimingInfo(LoadTimingInfo* load_timing_info) const override;
 
  private:
-  // QuicChromiumClientStream::Delegate implementation:
-  void OnClose() override;
-  void OnError(int error) override;
-
-  // Write headers to the stream and returns true on success. Posts a task to
-  // notify the delegate asynchronously and returns false on failure
-  bool WriteHeaders();
-
+  int WriteHeaders();
   void OnStreamReady(int rv);
   void OnSendDataComplete(int rv);
   void ReadInitialHeaders();
@@ -105,6 +97,7 @@ class NET_EXPORT_PRIVATE BidirectionalStreamQuicImpl
   LoadTimingInfo::ConnectTiming connect_timing_;
 
   SpdyHeaderBlock initial_headers_;
+  bool expect_trailers_;  // True if trailers are expected to arrive.
   SpdyHeaderBlock trailing_headers_;
 
   // User provided read buffer for ReadData() response.