Ensure we don't load plugins on the IO thread

webkit/glue/plugins/plugin_lib.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 "webkit/glue/plugins/plugin_lib.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/stats_counters.h"
 #include "base/string_util.h"
@@ skipping 18 matching lines @@
   if (!g_loaded_libs)
     g_loaded_libs = new std::vector<scoped_refptr<PluginLib> >;
 
   for (size_t i = 0; i < g_loaded_libs->size(); ++i) {
     if ((*g_loaded_libs)[i]->plugin_info().path == filename)
       return (*g_loaded_libs)[i];
   }
 
   WebPluginInfo info;
   const PluginEntryPoints* entry_points = NULL;
-  if (!PluginList::ReadPluginInfo(filename, &info, &entry_points))
+  if (!PluginList::Singleton()->ReadPluginInfo(filename, &info, &entry_points))
     return NULL;
 
   return new PluginLib(info, entry_points);
 }
 
 void PluginLib::UnloadAllPlugins() {
   if (g_loaded_libs) {
     for (size_t i = 0; i < g_loaded_libs->size(); ++i)
       (*g_loaded_libs)[i]->Unload();
 
@@ skipping 215 matching lines @@
 }
 
 void PluginLib::Shutdown() {
   if (initialized_ && !internal_) {
     NP_Shutdown();
     initialized_ = false;
   }
 }
 
 }  // namespace NPAPI