Fix check for removed plug-in while loading a blocked plug-in.

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 eae3e0ef7d7ff630928b8a16f1e6b4a2b19d79fb..0e58e7286f22259d2ed56ea98f277df672257947 100644
--- a/chrome/renderer/plugins/plugin_placeholder.cc
+++ b/chrome/renderer/plugins/plugin_placeholder.cc
@@ -323,7 +323,7 @@ void PluginPlaceholder::ReplacePlugin(WebPlugin* new_plugin) {
 
   // The plug-in has been removed from the page. Destroy the old plug-in
   // (which will destroy us).
-  if (element.parentNode().isNull()) {
+  if (!element.pluginContainer()) {
     plugin_->destroy();
     return;
   }