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

chrome/browser/renderer_host/plugin_info_message_filter.cc

Index: chrome/browser/renderer_host/plugin_info_message_filter.cc
diff --git a/chrome/browser/renderer_host/plugin_info_message_filter.cc b/chrome/browser/renderer_host/plugin_info_message_filter.cc
index 3054e49c8af55b7345050c55fbfc58a3a0a3a03c..0d3ef6b8d7ef0943bb62134e3d448955645431c8 100644
--- a/chrome/browser/renderer_host/plugin_info_message_filter.cc
+++ b/chrome/browser/renderer_host/plugin_info_message_filter.cc
@@ -24,6 +24,10 @@
 #include "googleurl/src/gurl.h"
 #include "webkit/plugins/npapi/plugin_list.h"
 
+#if defined(OS_WIN)
+#include "base/win/metro.h"
+#endif
+
 using content::PluginService;
 using webkit::WebPluginInfo;
 
@@ -135,6 +139,17 @@ void PluginInfoMessageFilter::Context::DecidePluginStatus(
   *group_name = plugin_metadata->name();
   *group_identifier = plugin_metadata->identifier();
 
+#if defined(OS_WIN)
+  if (base::win::IsMetroProcess()) {
+    // In metro mode we only allow pepper plugins.
+    if (plugin.type == WebPluginInfo::PLUGIN_TYPE_NPAPI) {
+      status->value =
+          ChromeViewHostMsg_GetPluginInfo_Status::kNpapiNotSupported;
+      return;
+    }
+  }
+#endif
+
   ContentSetting plugin_setting = CONTENT_SETTING_DEFAULT;
   bool uses_default_content_setting = true;
   // Check plug-in content settings. The primary URL is the top origin URL and