chromecast: Cleanup class/struct fwd declarations

chromecast/browser/devtools/remote_debugging_server.h

 // Copyright 2014 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 CHROMECAST_BROWSER_DEVTOOLS_REMOTE_DEBUGGING_SERVER_H_
 #define CHROMECAST_BROWSER_DEVTOOLS_REMOTE_DEBUGGING_SERVER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "components/prefs/pref_member.h"
 
 namespace chromecast {
 namespace shell {
 
-class CastDevToolsManagerDelegate;
-
 class RemoteDebuggingServer {
  public:
   explicit RemoteDebuggingServer(bool start_immediately);
   ~RemoteDebuggingServer();
 
  private:
   // Called when pref_enabled_ is changed.
   void OnEnabledChanged();
   BooleanPrefMember pref_enabled_;
   uint16_t port_;
   bool is_started_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteDebuggingServer);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_DEVTOOLS_REMOTE_DEBUGGING_SERVER_H_