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

android_webview/native/aw_dev_tools_server.h

 // Copyright 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 ANDROID_WEBVIEW_NATIVE_AW_DEV_TOOLS_SERVER_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_DEV_TOOLS_SERVER_H_
 
 #include <jni.h>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace devtools_http_handler {
 class DevToolsHttpHandler;
 }
 
 namespace android_webview {
 
-class AwDevToolsManagerDelegate;
-
 // This class controls WebView-specific Developer Tools remote debugging server.
 class AwDevToolsServer {
  public:
   AwDevToolsServer();
   ~AwDevToolsServer();
 
   // Opens linux abstract socket to be ready for remote debugging.
   void Start();
 
   // Closes debugging socket, stops debugging.
   void Stop();
 
   bool IsStarted() const;
 
  private:
-  // TODO(dgozman): remove once devtools_discovery component is extracted.
-  scoped_ptr<AwDevToolsManagerDelegate> manager_delegate_;
   scoped_ptr<devtools_http_handler::DevToolsHttpHandler> devtools_http_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(AwDevToolsServer);
 };
 
 bool RegisterAwDevToolsServer(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_DEV_TOOLS_SERVER_H_