[DevTools] Inline IPCDevToolsAgentHost into subclasses.

content/browser/devtools/ipc_devtools_agent_host.h

-// Copyright (c) 2013 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_DEVTOOLS_IPC_DEVTOOLS_AGENT_HOST_H_
-#define CONTENT_BROWSER_DEVTOOLS_IPC_DEVTOOLS_AGENT_HOST_H_
-
-#include "content/browser/devtools/devtools_agent_host_impl.h"
-#include "content/common/devtools_messages.h"
-
-namespace IPC {
-class Message;
-}
-
-namespace content {
-
-class CONTENT_EXPORT IPCDevToolsAgentHost : public DevToolsAgentHostImpl {
- public:
-  // DevToolsAgentHostImpl implementation.
-  void Attach() override;
-  void Detach() override;
-  bool DispatchProtocolMessage(const std::string& message) override;
-  void InspectElement(int x, int y) override;
-
- protected:
-  IPCDevToolsAgentHost();
-  ~IPCDevToolsAgentHost() override;
-
-  void Reattach();
-  void ProcessChunkedMessageFromAgent(const DevToolsMessageChunk& chunk);
-
-  virtual void SendMessageToAgent(IPC::Message* msg) = 0;
-  virtual void OnClientAttached(bool reattached) = 0;
-  virtual void OnClientDetached() = 0;
-
- private:
-  std::string message_buffer_;
-  uint32 message_buffer_size_;
-  std::string state_cookie_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_DEVTOOLS_IPC_DEVTOOLS_AGENT_HOST_H_