Use a vector of smart pointers for callback return type.

chrome/browser/ui/webui/offline/offline_internals_ui_message_handler.h

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OFFLINE_OFFLINE_INTERNALS_UI_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OFFLINE_OFFLINE_INTERNALS_UI_MESSAGE_HANDLER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "components/offline_pages/background/request_coordinator.h"
@@ skipping 45 matching lines @@
 
   // Callback for async GetAllPages calls.
   void HandleStoredPagesCallback(
       std::string callback_id,
       const offline_pages::MultipleOfflinePageItemResult& pages);
 
   // Callback for async GetRequests calls.
   void HandleRequestQueueCallback(
       std::string callback_id,
       offline_pages::RequestQueue::GetRequestsResult result,
-      const std::vector<offline_pages::SavePageRequest>& requests);
+      std::vector<std::unique_ptr<offline_pages::SavePageRequest>> requests);
 
   // Callback for DeletePage/ClearAll calls.
   void HandleDeletedPagesCallback(std::string callback_id,
                                   const offline_pages::DeletePageResult result);
 
   // Turns a DeletePageResult enum into logical string.
   std::string GetStringFromDeletePageResult(
       offline_pages::DeletePageResult value);
 
   // Turns a SavePageRequest::Status into logical string.
   std::string GetStringFromSavePageStatus();
 
   // Offline page model to call methods on.
   offline_pages::OfflinePageModel* offline_page_model_;
 
   // Request coordinator for background offline actions.
   offline_pages::RequestCoordinator* request_coordinator_;
 
   // Factory for creating references in callbacks.
   base::WeakPtrFactory<OfflineInternalsUIMessageHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflineInternalsUIMessageHandler);
 };
 
 }  // namespace offline_internals
 
 #endif // CHROME_BROWSER_UI_WEBUI_OFFLINE_OFFLINE_INTERNALS_UI_MESSAGE_HANDLER_H_