Remove 'WebPlugin::CheckIfRunInsecureContent'.

content/child/npapi/webplugin.h

Index: content/child/npapi/webplugin.h
diff --git a/content/child/npapi/webplugin.h b/content/child/npapi/webplugin.h
index 9eb0be988fe8fb1c9f513a3e944d79cb2ff31410..99fea757c9d13b2333eb45f2b8adc06260667a84 100644
--- a/content/child/npapi/webplugin.h
+++ b/content/child/npapi/webplugin.h
@@ -94,10 +94,6 @@ class WebPlugin {
   // HTTP URL redirect notifications.
   virtual void URLRedirectResponse(bool allow, int resource_id) = 0;
 
-  // Returns true if the new url is a secure transition. This is to catch a
-  // plugin src url transitioning from https to http.
-  virtual bool CheckIfRunInsecureContent(const GURL& url) = 0;
-
 #if defined(OS_WIN)
   // |pump_messages_event| is a event handle which is used in NPP_HandleEvent
   // calls to pump messages if the plugin enters a modal loop.