Convert the PluginService interface to be an async wrapper around PluginList.

content/browser/renderer_host/render_message_filter.h

Index: content/browser/renderer_host/render_message_filter.h
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index 4079134e9a9bd4efca42ee94b319b19b239e99ea..4fda9dbc66086d0d6d731bf423316695f93c4f16 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -156,8 +156,9 @@ class RenderMessageFilter : public BrowserMessageFilter {
   void OnReleaseCachedFonts();
 #endif
 
-  void OnGetPlugins(bool refresh,
-                    std::vector<webkit::WebPluginInfo>* plugins);
+  void OnGetPlugins(bool refresh, IPC::Message* reply_msg);
+  void OnGetPluginsSendReply(IPC::Message* reply_msg,
+                             std::vector<webkit::WebPluginInfo> plugins);

[jam, 2011/09/21 00:04:51]

nit: const ref

   void OnGetPluginInfo(int routing_id,
                        const GURL& url,
                        const GURL& policy_url,