Block NPAPI plug-ins in Metro mode instead of not loading them at all.

chrome/renderer/chrome_content_renderer_client.cc

 // 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.
 
 #include "chrome/renderer/chrome_content_renderer_client.h"
 
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 500 matching lines @@
               render_view, frame, params, plugin, identifier, group_name,
               IDR_CLICK_TO_PLAY_PLUGIN_HTML,
               l10n_util::GetStringFUTF16(IDS_PLUGIN_LOAD, group_name));
           placeholder->set_blocked_for_prerendering(true);
           placeholder->set_allow_loading(true);
           break;
         }
 
         return render_view->CreatePlugin(frame, plugin, params);
       }
+      case ChromeViewHostMsg_GetPluginInfo_Status::kNPAPINotSupported: {
+        RenderThread::Get()->RecordUserMetrics("Plugin_NPAPINotSupported");
+        placeholder = PluginPlaceholder::CreateBlockedPlugin(
+            render_view, frame, params, plugin, identifier, group_name,
+            IDR_BLOCKED_PLUGIN_HTML,
+            l10n_util::GetStringUTF16(IDS_PLUGIN_NOT_SUPPORTED));
+        render_view->Send(new ChromeViewHostMsg_NPAPINotSupported(
+            render_view->GetRoutingID(), identifier));
+        break;
+      }
       case ChromeViewHostMsg_GetPluginInfo_Status::kDisabled: {
         placeholder = PluginPlaceholder::CreateBlockedPlugin(
             render_view, frame, params, plugin, identifier, group_name,
             IDR_DISABLED_PLUGIN_HTML,
             l10n_util::GetStringFUTF16(IDS_PLUGIN_DISABLED, group_name));
         break;
       }
       case ChromeViewHostMsg_GetPluginInfo_Status::kOutdatedBlocked: {
 #if defined(ENABLE_PLUGIN_INSTALLATION)
         placeholder = PluginPlaceholder::CreateBlockedPlugin(
@@ skipping 445 matching lines @@
 bool ChromeContentRendererClient::IsOtherExtensionWithWebRequestInstalled() {
   return extension_dispatcher_->IsOtherExtensionWithWebRequestInstalled();
 }
 
 void ChromeContentRendererClient::RegisterPPAPIInterfaceFactories(
     webkit::ppapi::PpapiInterfaceFactoryManager* factory_manager) {
   factory_manager->RegisterFactory(ChromePPAPIInterfaceFactory);
 }
 
 }  // namespace chrome