Remove all blimp network code.

blimp/net/pipe_manager.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_PIPE_MANAGER_H_
-#define BLIMP_NET_PIPE_MANAGER_H_
-
-#include "base/macros.h"
-#include "blimp/common/proto/blimp_message.pb.h"
-#include "blimp/net/blimp_net_export.h"
-
-namespace blimp {
-
-class BlimpMessageProcessor;
-
-class BLIMP_NET_EXPORT PipeManager {
- public:
-  virtual ~PipeManager() {}
-
-  // Registers a message processor |incoming_processor| which will receive all
-  // messages of the |feature_case| specified. Returns a BlimpMessageProcessor
-  // object for sending messages of the given feature.
-  virtual std::unique_ptr<BlimpMessageProcessor> RegisterFeature(
-      BlimpMessage::FeatureCase feature_case,
-      BlimpMessageProcessor* incoming_processor) = 0;
-};
-
-}  // namespace blimp
-
-#endif  // BLIMP_NET_PIPE_MANAGER_H_