Restart plugin loading only if the plugin list has actually become stale.

content/browser/plugin_service_impl.h

 // Copyright (c) 2012 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.
 
 // This class responds to requests from renderers for the list of plugins, and
 // also a proxy object for plugin instances.
 
 #ifndef CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_
 
@@ skipping 161 matching lines @@
       const base::FilePath& profile_data_directory);
   PpapiPluginProcessHost* FindPpapiBrokerProcess(
       const base::FilePath& broker_path);
 
   void RegisterPepperPlugins();
 
   // Run on the blocking pool to load the plugins synchronously.
   void GetPluginsInternal(base::MessageLoopProxy* target_loop,
                           const GetPluginsCallback& callback);
 
+#if defined(OS_POSIX)
+  void GetPluginsOnIOThread(
+      base::MessageLoopProxy* target_loop,
+      const GetPluginsCallback& callback);
+#endif
+
   // Binding directly to GetAllowedPluginForOpenChannelToPlugin() isn't possible
   // because more arity is needed <http://crbug.com/98542>. This just forwards.
   void ForwardGetAllowedPluginForOpenChannelToPlugin(
       const PluginServiceFilterParams& params,
       const GURL& url,
       const std::string& mime_type,
       PluginProcessHost::Client* client,
       const std::vector<WebPluginInfo>&);
   // Helper so we can do the plugin lookup on the FILE thread.
   void GetAllowedPluginForOpenChannelToPlugin(
@@ skipping 47 matching lines @@
 
   // Used to detect if a given plug-in is crashing over and over.
   std::map<base::FilePath, std::vector<base::Time> > crash_times_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PLUGIN_SERVICE_IMPL_H_