Make PacketReader/PacketWriter interfaces async-only.

blimp/net/stream_packet_writer.h

 // Copyright 2015 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 BLIMP_NET_STREAM_PACKET_WRITER_H_
 #define BLIMP_NET_STREAM_PACKET_WRITER_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 17 matching lines @@
 //     kMaxPacketPayloadSizeBytes).
 class BLIMP_NET_EXPORT StreamPacketWriter : public PacketWriter {
  public:
   // |socket|: The socket to write packets to. The caller must ensure |socket|
   // is valid while the reader is in-use (see ReadPacket below).
   explicit StreamPacketWriter(net::StreamSocket* socket);
 
   ~StreamPacketWriter() override;
 
   // PacketWriter implementation.
-  int WritePacket(scoped_refptr<net::DrainableIOBuffer> data,
-                  const net::CompletionCallback& callback) override;
+  void WritePacket(scoped_refptr<net::DrainableIOBuffer> data,
+                   const net::CompletionCallback& callback) override;
 
  private:
   enum class WriteState {
     IDLE,
     HEADER,
     PAYLOAD,
   };
 
   friend std::ostream& operator<<(std::ostream& out, const WriteState state);
 
@@ skipping 19 matching lines @@
   net::CompletionCallback callback_;
 
   base::WeakPtrFactory<StreamPacketWriter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StreamPacketWriter);
 };
 
 }  // namespace blimp
 
 #endif  // BLIMP_NET_STREAM_PACKET_WRITER_H_