[DevTools] Move DevToolsClientHost functionality out of DevToolsFrontendHost.

content/browser/devtools/devtools_frontend_host.h

-// Copyright (c) 2012 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_DEVTOOLS_FRONTEND_HOST_H_
-#define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_FRONTEND_HOST_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "content/public/browser/devtools_client_host.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace content {
-
-class DevToolsFrontendHostDelegate;
-class WebContentsImpl;
-
-// This class handles messages from DevToolsClient and calls corresponding
-// methods on DevToolsFrontendHostDelegate which is implemented by the
-// embedder. This allows us to avoid exposing DevTools client messages through
-// the content public API.
-class DevToolsFrontendHost : public DevToolsClientHost,
-                             public WebContentsObserver {
- public:
-  DevToolsFrontendHost(WebContentsImpl* web_contents,
-                       DevToolsFrontendHostDelegate* delegate);
-
- private:
-  virtual ~DevToolsFrontendHost();
-
-  // DevToolsClientHost implementation.
-  virtual void DispatchOnInspectorFrontend(const std::string& message) OVERRIDE;
-  virtual void InspectedContentsClosing() OVERRIDE;
-  virtual void ReplacedWithAnotherClient() OVERRIDE;
-
-  // WebContentsObserver overrides.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-  virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
-
-  void OnDispatchOnInspectorBackend(const std::string& message);
-  void OnDispatchOnEmbedder(const std::string& message);
-
-  DevToolsFrontendHostDelegate* delegate_;
-  DISALLOW_COPY_AND_ASSIGN(DevToolsFrontendHost);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_FRONTEND_HOST_H_