Cleanup: Remove unneeded forward declarations in ppapi.

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

Index: ppapi/native_client/src/trusted/plugin/scriptable_handle.h
===================================================================
--- ppapi/native_client/src/trusted/plugin/scriptable_handle.h	(revision 109579)
+++ ppapi/native_client/src/trusted/plugin/scriptable_handle.h	(working copy)
@@ -1,10 +1,7 @@
-/*
- * Copyright 2011 (c) 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.
- */
+// 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 browser scriptable container class.  The methods on this class
 // are defined in the specific API directories.
 
@@ -28,8 +25,6 @@
 #include "ppapi/cpp/dev/scriptable_object_deprecated.h"
 #include "ppapi/cpp/private/var_private.h"
 
-struct NaClDesc;
-
 namespace plugin {
 
 // Forward declarations for externals.