Remove all blimp network code.

blimp/net/blimp_engine_transport.h

-// Copyright 2016 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_ENGINE_TRANSPORT_H_
-#define BLIMP_NET_BLIMP_ENGINE_TRANSPORT_H_
-
-#include <memory>
-#include <string>
-
-#include "blimp/net/blimp_transport.h"
-#include "net/base/ip_endpoint.h"
-
-namespace blimp {
-
-// Interface specific to engine transport on top of generic |BlimpTransport|.
-class BlimpEngineTransport : public BlimpTransport {
- public:
-  ~BlimpEngineTransport() override {}
-
-  // Obtains the local listening address.
-  virtual void GetLocalAddress(net::IPEndPoint* ip_address) const = 0;
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_NET_BLIMP_ENGINE_TRANSPORT_H_