change navigation initiation type default value to RENDERER_INITIATED

ios/chrome/browser/web/navigation_manager_util.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/web/navigation_manager_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
-
-web::NavigationItem* GetLastNonRedirectedItem(
-    web::NavigationManager* nav_manager) {
-  if (!nav_manager || !nav_manager->GetItemCount())
-    return nullptr;
-  int index = nav_manager->GetCurrentItemIndex();
-  web::NavigationItem* item = nullptr;
-  while (index >= 0) {
-    item = nav_manager->GetItemAtIndex(index);
-    // Returns the first non-Redirect item found.
-    if ((item->GetTransitionType() & ui::PAGE_TRANSITION_IS_REDIRECT_MASK) == 0)
-      break;
-    --index;
-  }
-  return item;
-}