ppapi: Cleanup class/struct forward declarations

ppapi/proxy/video_capture_resource.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 PPAPI_PROXY_VIDEO_CAPTURE_RESOURCE_H_
 #define PPAPI_PROXY_VIDEO_CAPTURE_RESOURCE_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ppapi/c/dev/ppp_video_capture_dev.h"
 #include "ppapi/proxy/device_enumeration_resource_helper.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/thunk/ppb_video_capture_api.h"
 
 namespace ppapi {
 namespace proxy {
 
+class PluginDispatcher;
+
 class VideoCaptureResource
     : public PluginResource,
       public ::ppapi::thunk::PPB_VideoCapture_API {
  public:
   VideoCaptureResource(Connection connection,
                        PP_Instance instance,
                        PluginDispatcher* dispatcher);
   ~VideoCaptureResource() override;
 
   // PluginResource override.
@@ skipping 60 matching lines @@
 
   DeviceEnumerationResourceHelper enumeration_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_VIDEO_CAPTURE_RESOURCE_H_