Rollback the rollback of r1806. Wasn't the cause of the test failure.

webkit/glue/plugins/plugin_list.h

Index: webkit/glue/plugins/plugin_list.h
===================================================================
--- webkit/glue/plugins/plugin_list.h	(revision 1820)
+++ webkit/glue/plugins/plugin_list.h	(working copy)
@@ -151,9 +151,11 @@
   // Hardcoded logic to detect and load Java plugins
   void LoadJavaPlugin();
 
+#if defined(OS_WIN)
   // Search the registry at the given path and load plugins listed there.
   void LoadPluginsInRegistryFolder(HKEY root_key,
                                    const std::wstring& registry_folder);
+#endif
 
   // true if we shouldn't load the new WMP plugin.
   bool dont_load_new_wmp_;