Remove the old type system for proxied resources. These were no longer being used.

ppapi/proxy/plugin_resource.cc

 // 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.
 
 #include "ppapi/proxy/plugin_resource.h"
 
 namespace pp {
 namespace proxy {
 
 PluginResource::PluginResource(const HostResource& resource)
     : ResourceObjectBase(resource.instance()),
       host_resource_(resource) {
 }
 
 PluginResource::~PluginResource() {
 }
 
-#define DEFINE_TYPE_GETTER(RESOURCE)                    \
-  RESOURCE* PluginResource::As##RESOURCE() { return NULL; }
-FOR_ALL_PLUGIN_RESOURCES(DEFINE_TYPE_GETTER)
-#undef DEFINE_TYPE_GETTER
-
 PluginDispatcher* PluginResource::GetDispatcher() {
   PluginDispatcher* disp = PluginDispatcher::GetForInstance(instance());
   CHECK(disp);
   return disp;
 }
 
 }  // namespace proxy
 }  // namespace pp