Revert of [Chromoting] Add DataChannelManager to manage optional incoming data channels

remoting/protocol/data_channel_manager.h

Index: remoting/protocol/data_channel_manager.h
diff --git a/remoting/protocol/data_channel_manager.h b/remoting/protocol/data_channel_manager.h
deleted file mode 100644
index 32b0198b936347d9014800024b132bc59cce7a89..0000000000000000000000000000000000000000
--- a/remoting/protocol/data_channel_manager.h
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright 2017 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 REMOTING_PROTOCOL_DATA_CHANNEL_MANAGER_H_
-#define REMOTING_PROTOCOL_DATA_CHANNEL_MANAGER_H_
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-
-namespace remoting {
-namespace protocol {
-
-class MessagePipe;
-
-// DataChannelManager helps to manage optional data channels. Consumers can
-// register a function to handle data from a named data channel.
-class DataChannelManager final {
- public:
-  using CreateHandlerCallback = base::Callback<void(
-      const std::string& name,
-      std::unique_ptr<MessagePipe> pipe)>;
-
-  DataChannelManager();
-  ~DataChannelManager();
-
-  // Registers a factory function to handle a new incoming data channel with a
-  // name matching |prefix|. Both |constructor| and |prefix| cannot be empty.
-  void RegisterCreateHandlerCallback(const std::string& prefix,
-                                     CreateHandlerCallback constructor);
-
-  // Executes the registered callback to handle the new incoming data channel.
-  // Returns true if a handler of the new data channel has been executed.
-  bool OnIncomingDataChannel(const std::string& name,
-                             std::unique_ptr<MessagePipe> pipe);
-
- private:
-  std::vector<std::pair<std::string, CreateHandlerCallback>> constructors_;
-};
-
-}  // namespace protocol
-}  // namespace remoting
-
-#endif  // REMOTING_PROTOCOL_DATA_CHANNEL_MANAGER_H_