[Cronet] Make delaying sending request headers explicit in bidirectional stream

net/spdy/bidirectional_stream_spdy_impl.h

Index: net/spdy/bidirectional_stream_spdy_impl.h
diff --git a/net/spdy/bidirectional_stream_spdy_impl.h b/net/spdy/bidirectional_stream_spdy_impl.h
index 2ddd4f8fb1029846b3a12d86d17e87e2a1354403..a7e669e6a45e42bc203b10bb86243b5c32cdef61 100644
--- a/net/spdy/bidirectional_stream_spdy_impl.h
+++ b/net/spdy/bidirectional_stream_spdy_impl.h
@@ -42,7 +42,7 @@ class NET_EXPORT_PRIVATE BidirectionalStreamSpdyImpl
   // BidirectionalStreamImpl implementation:
   void Start(const BidirectionalStreamRequestInfo* request_info,
              const BoundNetLog& net_log,
-             bool disable_auto_flush,
+             bool delay_headers_until_next_send_data,
              BidirectionalStreamImpl::Delegate* delegate,
              std::unique_ptr<base::Timer> timer) override;
   int ReadData(IOBuffer* buf, int buf_len) override;
@@ -100,10 +100,8 @@ class NET_EXPORT_PRIVATE BidirectionalStreamSpdyImpl
   // After |stream_| has been closed, this keeps track of the total number of
   // bytes sent over the network for |stream_| while it was open.
   int64_t closed_stream_sent_bytes_;
-  // Whether auto flush is disabled.
-  bool disable_auto_flush_;
-  // Only relevant when |disable_auto_flush_| is true;
   // This is the combined buffer of buffers passed in through SendvData.
+  // Keep a reference here so it is alive until OnDataSent is invoked.
   scoped_refptr<IOBuffer> pending_combined_buffer_;
 
   base::WeakPtrFactory<BidirectionalStreamSpdyImpl> weak_factory_;