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

chrome/renderer/plugins/plugin_placeholder.cc

Index: chrome/renderer/plugins/plugin_placeholder.cc
diff --git a/chrome/renderer/plugins/plugin_placeholder.cc b/chrome/renderer/plugins/plugin_placeholder.cc
index e46e9e463dd5bcf84ae69a8bd472d5952af924ee..d407904f43a90b32d06f67001053bd7599a567c6 100644
--- a/chrome/renderer/plugins/plugin_placeholder.cc
+++ b/chrome/renderer/plugins/plugin_placeholder.cc
@@ -557,6 +557,18 @@ void PluginPlaceholder::LoadPlugin() {
     return;
   }
 
+  if (status_->value ==
+      ChromeViewHostMsg_GetPluginInfo_Status::kNpapiNotSupported) {
+#if defined(OS_WIN)
+    RenderThread::Get()->RecordUserMetrics("Metro_RestartOnDesktop_Plugin");
+    RenderThread::Get()->Send(

[cpu_(ooo_6.6-7.5), 2012/10/18 00:42:59]

we need a person from sec-team to approve this.

[Bernhard Bauer, 2012/10/18 09:13:57]

Chris, what's your opinion?

+        new ChromeViewHostMsg_RestartInDesktopMode(routing_id()));
+    return;
+#else
+    NOTREACHED();
+#endif
+  }
+
   // TODO(mmenke):  In the case of prerendering, feed into
   //                ChromeContentRendererClient::CreatePlugin instead, to
   //                reduce the chance of future regressions.