Pass Callback to TaskRunner by value and consume it on invocation (1)

components/history/core/browser/history_service.h

 // Copyright (c) 2012 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 COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 777 matching lines @@
   // Sets the in-memory URL database. This is called by the backend once the
   // database is loaded to make it available.
   void SetInMemoryBackend(std::unique_ptr<InMemoryHistoryBackend> mem_backend);
 
   // Called by our BackendDelegate when there is a problem reading the database.
   void NotifyProfileError(sql::InitStatus init_status,
                           const std::string& diagnostics);
 
   // Call to schedule a given task for running on the history thread with the
   // specified priority. The task will have ownership taken.
-  void ScheduleTask(SchedulePriority priority, const base::Closure& task);
+  void ScheduleTask(SchedulePriority priority, base::Closure task);
 
   // Called when the favicons for the given page URLs (e.g.
   // http://www.google.com) and the given icon URL (e.g.
   // http://www.google.com/favicon.ico) have changed. It is valid to call
   // NotifyFaviconsChanged() with non-empty |page_urls| and an empty |icon_url|
   // and vice versa.
   void NotifyFaviconsChanged(const std::set<GURL>& page_urls,
                              const GURL& icon_url);
 
   base::ThreadChecker thread_checker_;
@@ skipping 41 matching lines @@
 
   // All vended weak pointers are invalidated in Cleanup().
   base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_H_