Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/native_client/src/trusted/plugin/plugin.h

 // -*- c++ -*-
 // 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.
 
 // The portable representation of an instance and root scriptable object.
 // The PPAPI version of the plugin instantiates a subclass of this class.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
@@ skipping 17 matching lines @@
 #include "native_client/src/trusted/plugin/utility.h"
 
 #include "ppapi/cpp/private/var_private.h"
 // for pp::VarPrivate
 #include "ppapi/cpp/private/instance_private.h"
 #include "ppapi/cpp/rect.h"
 #include "ppapi/cpp/url_loader.h"
 #include "ppapi/cpp/var.h"
 
 struct NaClSrpcChannel;
-struct NaClDesc;
 
 namespace nacl {
 class DescWrapper;
 class DescWrapperFactory;
 }  // namespace nacl
 
 namespace pp {
 class Find_Dev;
 class MouseLock;
 class Printing_Dev;
@@ skipping 518 matching lines @@
   // in UpdateDownloadProgress to map a url loader back to the URL being
   // downloaded.
   const FileDownloader* FindFileDownloader(PP_Resource url_loader) const;
 
   int64_t last_event_bytes_received_;
 };
 
 }  // namespace plugin
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_