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

chrome/renderer/render_view.cc

 // Copyright (c) 2011 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 "chrome/renderer/render_view.h"
 
 #include <algorithm>
 #include <cmath>
 #include <string>
 #include <vector>
@@ skipping 2707 matching lines @@
                                    IDR_BLOCKED_PLUGIN_HTML,
                                    IDS_PLUGIN_OUTDATED,
                                    false);
   }
 
   if (!webkit::npapi::IsPluginEnabled(info))
     return NULL;
 
   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) {
     // Delay loading plugins if prerendering.
     WebDataSource* ds = frame->dataSource();
     NavigationState* navigation_state = NavigationState::FromDataSource(ds);
     if (navigation_state->is_prerendering()) {
       return CreatePluginPlaceholder(frame,
                                      params,
                                      *group,
@@ skipping 3012 matching lines @@
   if (cmd == kJavaScriptStressTestSetStressRunType) {
     v8::Testing::SetStressRunType(static_cast<v8::Testing::StressType>(param));
   } else if (cmd == kJavaScriptStressTestPrepareStressRun) {
     v8::Testing::PrepareStressRun(param);
   }
 }
 
 void RenderView::OnContextMenuClosed() {
   context_menu_node_.reset();
 }