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 3f20ee13a9db3bee54d3b85d34306d5f3b062568..55ea0d0e6628619468ffd9e431d9186a9b266db3 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);
@@ -57,10 +56,6 @@ 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;
-
   bool WriteHeaders();
   void OnStreamReady(int rv);
   void OnSendDataComplete(int rv);
@@ -94,6 +89,7 @@ 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.