Cleanup: Remove unneeded forward declarations in ppapi.

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

Index: ppapi/native_client/src/trusted/plugin/method_map.h
===================================================================
--- ppapi/native_client/src/trusted/plugin/method_map.h	(revision 109579)
+++ ppapi/native_client/src/trusted/plugin/method_map.h	(working copy)
@@ -1,8 +1,6 @@
-/*
- * Copyright 2008 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.
 
 // Lookup table types for method dispatching.
 
@@ -19,8 +17,6 @@
 
 namespace plugin {
 
-class Plugin;
-
 bool InitSrpcArgArray(NaClSrpcArg* arr, int size);
 void FreeSrpcArg(NaClSrpcArg* arg);