linux: only create browser-side plugin container after plugin requests it

webkit/glue/plugins/webplugin_delegate_impl_gtk.cc

Index: webkit/glue/plugins/webplugin_delegate_impl_gtk.cc
diff --git a/webkit/glue/plugins/webplugin_delegate_impl_gtk.cc b/webkit/glue/plugins/webplugin_delegate_impl_gtk.cc
index c20fee05aa9185623176d05ce43e6dd3b0898967..9f9838b8304e098b20560b041c07ca0495e0d7bb 100644
--- a/webkit/glue/plugins/webplugin_delegate_impl_gtk.cc
+++ b/webkit/glue/plugins/webplugin_delegate_impl_gtk.cc
@@ -263,12 +263,10 @@ bool WebPluginDelegateImpl::WindowedCreatePlugin() {
     return false;
   }
 
-  window_.window = reinterpret_cast<void*>(parent_);
-  // The remainder of the code expects windowed_handle_ to exist for
-  // windowed mode, despite not actually ever reaching through
-  // windowed_handle_.  It is still used as a token to represent "this
-  // plugin" in messages to the browser.
-  windowed_handle_ = parent_;
+  // Xembed plugins need a window created for them browser-side.
+  // Do that now.
+  windowed_handle_ = plugin_->CreatePluginContainer();
+  window_.window = reinterpret_cast<void*>(windowed_handle_);
 
   if (!window_.ws_info)
     window_.ws_info = new NPSetWindowCallbackStruct;