Put some plug-ins behind an infobar, where they have:...

chrome/renderer/render_view.cc

Index: chrome/renderer/render_view.cc
===================================================================
--- chrome/renderer/render_view.cc	(revision 72559)
+++ chrome/renderer/render_view.cc	(working copy)
@@ -2725,6 +2725,26 @@
 
   ContentSetting host_setting =
       current_content_settings_.settings[CONTENT_SETTINGS_TYPE_PLUGINS];
+
+  if (group->RequiresAuthorization() &&
+      !cmd->HasSwitch(switches::kAlwaysAuthorizePlugins) &&
+      (plugin_setting == CONTENT_SETTING_ALLOW ||
+       plugin_setting == CONTENT_SETTING_ASK) &&
+      host_setting == CONTENT_SETTING_DEFAULT) {
+    // TODO(cevans) - may need some form of "always allow this web site",
+    // either via an explicit button or integration with the blocked-plugin
+    // bubble.

[Bernhard Bauer, 2011/01/26 12:49:25]

Nit: Comment unnecessary?

+    Send(new ViewHostMsg_BlockedOutdatedPlugin(routing_id_,
+                                               group->GetGroupName(),
+                                               GURL()));
+    return CreatePluginPlaceholder(frame,
+                                   params,
+                                   *group,
+                                   IDR_BLOCKED_PLUGIN_HTML,
+                                   IDS_PLUGIN_NOT_AUTHORIZED,
+                                   false);
+  }
+
   if (info.path.value() == webkit::npapi::kDefaultPluginLibraryName ||
       plugin_setting == CONTENT_SETTING_ALLOW ||
       host_setting == CONTENT_SETTING_ALLOW) {