Remove all blimp network code.

blimp/net/blimp_message_checkpointer.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_BLIMP_MESSAGE_CHECKPOINTER_H_
-#define BLIMP_NET_BLIMP_MESSAGE_CHECKPOINTER_H_
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "base/timer/timer.h"
-#include "blimp/net/blimp_message_processor.h"
-#include "blimp/net/blimp_net_export.h"
-
-namespace blimp {
-
-class BlimpMessage;
-class BlimpMessageCheckpointObserver;
-
-// Utility class configured with incoming & outgoing MessageProcessors,
-// responsible for dispatching checkpoint/ACK messages to the outgoing
-// processor, as the incoming processor completes processing them.
-// Checkpoint/ACK message dispatch may be deferred for a second or
-// two to avoid saturating the link with ACK traffic; feature implementations
-// need to account for this latency in their design.
-// BlimpMessageCheckpointer is created on the UI thread, and then used and
-// destroyed on the IO thread.
-class BLIMP_NET_EXPORT BlimpMessageCheckpointer : public BlimpMessageProcessor {
- public:
-  BlimpMessageCheckpointer(BlimpMessageProcessor* incoming_processor,
-                           BlimpMessageProcessor* outgoing_processor,
-                           BlimpMessageCheckpointObserver* checkpoint_observer);
-  ~BlimpMessageCheckpointer() override;
-
-  // BlimpMessageProcessor interface.
-  void ProcessMessage(std::unique_ptr<BlimpMessage> message,
-                      const net::CompletionCallback& callback) override;
-
- private:
-  void InvokeCompletionCallback(const net::CompletionCallback& callback,
-                                int result);
-  void SendCheckpointAck();
-
-  BlimpMessageProcessor* incoming_processor_;
-  BlimpMessageProcessor* outgoing_processor_;
-  BlimpMessageCheckpointObserver* checkpoint_observer_;
-
-  // Holds the Id of the message that most recently completed processing.
-  int64_t checkpoint_id_ = 0;
-
-  // Used to batch multiple processed messages into a single ACK.
-  base::OneShotTimer defer_timer_;
-
-  // Used to abandon pending ProcessMessage completion callbacks on deletion.
-  base::WeakPtrFactory<BlimpMessageCheckpointer> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(BlimpMessageCheckpointer);
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_NET_BLIMP_MESSAGE_CHECKPOINTER_H_