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

chrome/plugin/npobject_stub.cc

Index: chrome/plugin/npobject_stub.cc
===================================================================
--- chrome/plugin/npobject_stub.cc	(revision 2981)
+++ chrome/plugin/npobject_stub.cc	(working copy)
@@ -260,6 +260,7 @@
 }
 
 void NPObjectStub::OnEvaluate(const std::string& script,
+                              bool popups_allowed,
                               IPC::Message* reply_msg) {
   if (IsPluginProcess()) {
     NOTREACHED() << "Should only be called on NPObjects in the renderer";
@@ -277,7 +278,8 @@
   script_string.UTF8Characters = script.c_str();
   script_string.UTF8Length = static_cast<unsigned int>(script.length());
 
-  bool return_value = NPN_Evaluate(0, npobject_, &script_string, &result_var);
+  bool return_value = NPN_EvaluateHelper(0, popups_allowed, npobject_,
+                                         &script_string, &result_var);
 
   NPVariant_Param result_param;
   CreateNPVariantParam(result_var, local_channel, &result_param, true);