Revert "DevTools: introduce DevToolsAgentHost"

content/browser/debugger/devtools_agent_host.h

-// Copyright (c) 2011 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 CONTENT_BROWSER_DEBUGGER_DEVTOOLS_AGENT_HOST_H_
-#define CONTENT_BROWSER_DEBUGGER_DEVTOOLS_AGENT_HOST_H_
-#pragma once
-
-namespace IPC {
-class Message;
-}
-
-// Describes interface for managing devtools agents from the browser process.
-class DevToolsAgentHost {
- public:
-  class CloseListener {
-   public:
-    virtual void AgentHostClosing(DevToolsAgentHost*) = 0;
-   protected:
-    virtual ~CloseListener() {}
-  };
-
-  // Sends the message to the devtools agent hosted by this object.
-  virtual void SendMessageToAgent(IPC::Message* msg) = 0;
-
-  // TODO(yurys): get rid of this method
-  virtual void NotifyClientClosing() = 0;
-
-  virtual void ClientDetached() = 0;
-
-  void set_close_listener(CloseListener* listener) {
-    close_listener_ = listener;
-  }
-
- protected:
-  DevToolsAgentHost();
-  virtual ~DevToolsAgentHost() {}
-
-  void NotifyCloseListener();
-
-  CloseListener* close_listener_;
-};
-
-#endif  // CONTENT_BROWSER_DEBUGGER_DEVTOOLS_AGENT_HOST_H_