[DevTools] Cleanup DevToolsTarget and DevToolsManagerDelegate after moving to devtools_discovery.

chrome/browser/devtools/remote_debugging_server.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 CHROME_BROWSER_DEVTOOLS_REMOTE_DEBUGGING_SERVER_H_
 #define CHROME_BROWSER_DEVTOOLS_REMOTE_DEBUGGING_SERVER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/host_desktop.h"
 
 namespace devtools_http_handler {
 class DevToolsHttpHandler;
 }
 
-class ChromeDevToolsManagerDelegate;
-
 class RemoteDebuggingServer {
  public:
   static void EnableTetheringForDebug();
 
   RemoteDebuggingServer(chrome::HostDesktopType host_desktop_type,
                         const std::string& ip,
                         uint16 port);
 
   virtual ~RemoteDebuggingServer();
 
  private:
-  // TODO(dgozman): remove once devtools_discovery component is extracted.
-  scoped_ptr<ChromeDevToolsManagerDelegate> manager_delegate_;
   scoped_ptr<devtools_http_handler::DevToolsHttpHandler> devtools_http_handler_;
   DISALLOW_COPY_AND_ASSIGN(RemoteDebuggingServer);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_REMOTE_DEBUGGING_SERVER_H_