This fixes http://code.google.com/p/chromium/issues/detail?id=2472, which...

chrome/plugin/npobject_proxy.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_proxy.h"
 
 #include "chrome/common/plugin_messages.h"
 #include "chrome/common/win_util.h"
 #include "chrome/plugin/npobject_util.h"
 #include "chrome/plugin/plugin_channel_base.h"
@@ skipping 306 matching lines @@
 bool NPObjectProxy::NPNEvaluate(NPP npp,
                                 NPObject *obj,
                                 NPString *script,
                                 NPVariant *result_var) {
   bool result = false;
   NPObjectProxy* proxy = GetProxy(obj);
   if (!proxy) {
     return false;
   }
 
+  bool popups_allowed = false;
+
+  if (npp) {
+    NPAPI::PluginInstance* plugin_instance =
+        reinterpret_cast<NPAPI::PluginInstance*>(npp->ndata);
+    if (plugin_instance)
+      popups_allowed = plugin_instance->popups_allowed();
+  }
+
   NPVariant_Param result_param;
   std::string script_str = std::string(
       script->UTF8Characters, script->UTF8Length);
 
   NPObjectMsg_Evaluate* msg = new NPObjectMsg_Evaluate(proxy->route_id(),
                                                        script_str,
+                                                       popups_allowed,
                                                        &result_param,
                                                        &result);
 
   // Please refer to the comments in NPObjectProxy::NPInvokePrivate for
   // the reasoning behind setting the pump messages event in the sync message.
   msg->set_pump_messages_event(proxy->modal_dialog_event_);
   proxy->Send(msg);
   if (!result)
     return false;
 
   CreateNPVariant(
       result_param, proxy->channel(), result_var, proxy->modal_dialog_event_);
   return true;
 }
 
 void NPObjectProxy::NPNSetException(NPObject *obj,
                                     const NPUTF8 *message) {
   NPObjectProxy* proxy = GetProxy(obj);
   if (!proxy) {
     return;
   }
 
   NPVariant_Param result_param;
   std::string message_str(message);
 
   proxy->Send(new NPObjectMsg_SetException(proxy->route_id(), message_str));
 }