Made renderer-initiated requests registration more reliable.

ios/web/navigation/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.
 
 #include "ios/web/navigation/navigation_manager_util.h"
 
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace web {
 
+NavigationItem* GetItemWithUniqueID(NavigationManager* navigation_manager,
+                                    int unique_id) {
+  NavigationItem* transient_item = navigation_manager->GetTransientItem();
+  if (transient_item && transient_item->GetUniqueID() == unique_id)
+    return transient_item;
+
+  NavigationItem* pending_item = navigation_manager->GetPendingItem();
+  if (pending_item && pending_item->GetUniqueID() == unique_id)
+    return pending_item;
+
+  return GetCommittedItemWithUniqueID(navigation_manager, unique_id);
+}
+
 NavigationItem* GetCommittedItemWithUniqueID(
     NavigationManager* navigation_manager,
     int unique_id) {
   int index = GetCommittedItemIndexWithUniqueID(navigation_manager, unique_id);
   return index != -1 ? navigation_manager->GetItemAtIndex(index) : nullptr;
 }
 
 int GetCommittedItemIndexWithUniqueID(NavigationManager* navigation_manager,
                                       int unique_id) {
   for (int i = 0; i < navigation_manager->GetItemCount(); i++) {
     web::NavigationItem* item = navigation_manager->GetItemAtIndex(i);
     if (item->GetUniqueID() == unique_id) {
       return i;
     }
   }
   return -1;
 }
 
 }  // namespace web