Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/proxy/dispatcher.h

 // 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.
 
 #ifndef PPAPI_PROXY_DISPATCHER_H_
 #define PPAPI_PROXY_DISPATCHER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/tracked_objects.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/proxy/proxy_channel.h"
 #include "ppapi/proxy/interface_list.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/shared_impl/api_id.h"
 
 namespace ppapi {
 
-class WebKitForwarding;
-
 namespace proxy {
 
 class VarSerializationRules;
 
 // An interface proxy can represent either end of a cross-process interface
 // call. The "source" side is where the call is invoked, and the "target" side
 // is where the call ends up being executed.
 //
 // Plugin side                          | Browser side
 // -------------------------------------|--------------------------------------
@@ skipping 76 matching lines @@
 
   scoped_ptr<VarSerializationRules> serialization_rules_;
 
   DISALLOW_COPY_AND_ASSIGN(Dispatcher);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_DISPATCHER_H_