Remove unused fields from //content.

content/public/browser/load_notification_details.h

Index: content/public/browser/load_notification_details.h
diff --git a/content/public/browser/load_notification_details.h b/content/public/browser/load_notification_details.h
index 22af84cab69804f525abfe70827bec3ad8adecbc..b02e0f0f0a79d9530a4c4440ccacbf8c8139fa35 100644
--- a/content/public/browser/load_notification_details.h
+++ b/content/public/browser/load_notification_details.h
@@ -17,14 +17,12 @@ namespace content {
 // log page load metrics.
 struct LoadNotificationDetails {
   LoadNotificationDetails(const GURL& url,
-                          ui::PageTransition origin,
                           base::TimeDelta load_time,
                           NavigationController* controller,
                           int session_index)
       : url(url),
         load_time(load_time),
         session_index(session_index),
-        origin(origin),
         controller(controller) {}
 
   // The URL loaded.
@@ -36,9 +34,6 @@ struct LoadNotificationDetails {
   // The index of the load within the tab session.
   int session_index;
 
-  // The type of action that caused the load.
-  ui::PageTransition origin;
-
   // The NavigationController for the load.
   NavigationController* controller;
 };