Use top frame's origin when checking content settings for plugins.

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 44df2ada30b0292ddaba658a7526b65ff48cf291..43dd8f88710ded3f35a43779f31b5b0eeff0e466 100644
--- a/chrome/renderer/plugins/chrome_plugin_placeholder.cc
+++ b/chrome/renderer/plugins/chrome_plugin_placeholder.cc
@@ -247,10 +247,11 @@ void ChromePluginPlaceholder::PluginListChanged() {
 
   ChromeViewHostMsg_GetPluginInfo_Output output;
   std::string mime_type(GetPluginParams().mimeType.utf8());
+  blink::WebString top_origin = GetFrame()->top()->securityOrigin().toString();
   render_frame()->Send(
       new ChromeViewHostMsg_GetPluginInfo(routing_id(),
                                           GURL(GetPluginParams().url),
-                                          document.url(),
+                                          GURL(top_origin),
                                           mime_type,
                                           &output));
   if (output.status == status_)