Remove all blimp network code.

blimp/net/null_blimp_message_processor.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_NULL_BLIMP_MESSAGE_PROCESSOR_H_
-#define BLIMP_NET_NULL_BLIMP_MESSAGE_PROCESSOR_H_
-
-#include "blimp/net/blimp_message_processor.h"
-#include "blimp/net/blimp_net_export.h"
-#include "net/base/net_errors.h"
-
-namespace blimp {
-
-// Dumps all incoming messages into a black hole and immediately notifies the
-// callback of success.
-class BLIMP_NET_EXPORT NullBlimpMessageProcessor
-    : public BlimpMessageProcessor {
- public:
-  ~NullBlimpMessageProcessor() override;
-
-  void ProcessMessage(std::unique_ptr<BlimpMessage> message,
-                      const net::CompletionCallback& callback) override;
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_NET_NULL_BLIMP_MESSAGE_PROCESSOR_H_