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

remoting/protocol/data_channel_manager.cc

-// 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.
-
-#include "remoting/protocol/data_channel_manager.h"
-
-#include <utility>
-
-#include "base/logging.h"
-#include "remoting/protocol/message_pipe.h"
-
-namespace remoting {
-namespace protocol {
-
-DataChannelManager::DataChannelManager() = default;
-DataChannelManager::~DataChannelManager() = default;
-
-void DataChannelManager::RegisterCreateHandlerCallback(
-    const std::string& prefix,
-    CreateHandlerCallback constructor) {
-  DCHECK(!prefix.empty());
-  DCHECK(constructor);
-  constructors_.push_back(std::make_pair(prefix, constructor));
-}
-
-bool DataChannelManager::OnIncomingDataChannel(
-    const std::string& name,
-    std::unique_ptr<MessagePipe> pipe) {
-  for (auto& constructor : constructors_) {
-    if (name.find(constructor.first) == 0) {
-      constructor.second.Run(name, std::move(pipe));
-      return true;
-    }
-  }
-  return false;
-}
-
-}  // namespace protocol
-}  // namespace remoting