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 1b3864661fd14666f77fc486d98be40c07cb560b..8ec93aeee10ba650a9bbd09cd51136a2f5c235d5 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);
@@ -54,14 +53,7 @@ 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();