Add the "virtual" keyword on method overrides that are missing it.

chrome/plugin/npobject_stub.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/plugin/npobject_stub.h"
 
 #include "chrome/common/child_process_logging.h"
 #include "chrome/common/plugin_messages.h"
 #include "chrome/plugin/npobject_util.h"
 #include "chrome/plugin/plugin_channel_base.h"
@@ skipping 36 matching lines @@
   // We null out the underlying NPObject pointer since it's not valid anymore (
   // ScriptController manually deleted the object).  As a result,
   // OnMessageReceived won't dispatch any more messages.  Since this includes
   // OnRelease, this object won't get deleted until OnChannelError which might
   // not happen for a long time if this renderer process has a long lived
   // plugin instance to the same process.  So we delete this object manually.
   npobject_ = NULL;
   MessageLoop::current()->DeleteSoon(FROM_HERE, this);
 }
 
+NPObject* NPObjectStub::GetUnderlyingNPObject() {
+  return npobject_;
+}
+
+IPC::Channel::Listener* NPObjectStub::GetChannelListener() {
+  return static_cast<IPC::Channel::Listener*>(this);
+}
+
 void NPObjectStub::OnMessageReceived(const IPC::Message& msg) {
   child_process_logging::SetActiveURL(page_url_);
 
   if (!npobject_) {
     if (msg.is_sync()) {
       // The object could be garbage because the frame has gone away, so
       // just send an error reply to the caller.
       IPC::Message* reply = IPC::SyncMessage::GenerateReply(&msg);
       reply->set_reply_error();
       Send(reply);
@@ skipping 315 matching lines @@
   bool return_value = WebBindings::evaluateHelper(0, popups_allowed, npobject_,
                                                   &script_string, &result_var);
 
   NPVariant_Param result_param;
   CreateNPVariantParam(
       result_var, local_channel, &result_param, true, containing_window_,
       page_url_);
   NPObjectMsg_Evaluate::WriteReplyParams(reply_msg, result_param, return_value);
   local_channel->Send(reply_msg);
 }