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

chrome/plugin/npobject_proxy.cc

Index: chrome/plugin/npobject_proxy.cc
===================================================================
--- chrome/plugin/npobject_proxy.cc	(revision 2981)
+++ chrome/plugin/npobject_proxy.cc	(working copy)
@@ -324,12 +324,22 @@
     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);