[DISCARD] While getting plug-in info, use securityOrigin() of the top level frame

chrome/renderer/plugins/chrome_plugin_placeholder.cc

Index: chrome/renderer/plugins/chrome_plugin_placeholder.cc
diff --git a/chrome/renderer/plugins/chrome_plugin_placeholder.cc b/chrome/renderer/plugins/chrome_plugin_placeholder.cc
index 9aebe5215da662df3e1854dd5562e827041a84b8..bfeca82907874e4621273e608d44bc895809e739 100644
--- a/chrome/renderer/plugins/chrome_plugin_placeholder.cc
+++ b/chrome/renderer/plugins/chrome_plugin_placeholder.cc
@@ -281,8 +281,9 @@ void ChromePluginPlaceholder::OnCancelledDownloadingPlugin() {
 void ChromePluginPlaceholder::PluginListChanged() {
   if (!GetFrame() || !plugin())
     return;
-  WebDocument document = GetFrame()->top()->document();
-  if (document.isNull())
+  blink::WebSecurityOrigin top_level_origin =
+      GetFrame()->top()->securityOrigin();
+  if (top_level_origin.isNull())
     return;
 
   ChromeViewHostMsg_GetPluginInfo_Output output;
@@ -290,7 +291,7 @@ void ChromePluginPlaceholder::PluginListChanged() {
   render_frame()->Send(
       new ChromeViewHostMsg_GetPluginInfo(routing_id(),
                                           GURL(GetPluginParams().url),
-                                          document.url(),
+                                          GURL(top_level_origin.toString()),
                                           mime_type,
                                           &output));
   if (output.status.value == status_->value)