Remove support for NPObjects.

content/plugin/plugin_channel.h

 // Copyright (c) 2012 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 CONTENT_PLUGIN_PLUGIN_CHANNEL_H_
 #define CONTENT_PLUGIN_PLUGIN_CHANNEL_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 81 matching lines @@
   ScopedChildProcessReference process_ref_;
 
   // The id of the renderer who is on the other side of the channel.
   int renderer_id_;
 
   int in_send_;  // Tracks if we're in a Send call.
   bool log_messages_;  // True if we should log sent and received messages.
   bool incognito_; // True if the renderer is in incognito mode.
   scoped_refptr<MessageFilter> filter_;  // Handles the modal dialog events.
 
-  // Dummy NPP value used in the plugin process to represent entities other
-  // that other plugin instances for the purpose of object ownership tracking.
-  scoped_ptr<struct _NPP> npp_;
-
   DISALLOW_COPY_AND_ASSIGN(PluginChannel);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PLUGIN_PLUGIN_CHANNEL_H_