Pass Callback by value on PostTaskAndReply family

base/task_runner.cc

 // 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.
 
 #include "base/task_runner.h"
 
+#include <utility>
+
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/threading/post_task_and_reply_impl.h"
 
 namespace base {
 
 namespace {
 
 // TODO(akalin): There's only one other implementation of
 // PostTaskAndReplyImpl in WorkerPool.  Investigate whether it'll be
@@ skipping 21 matching lines @@
   return destination_->PostTask(from_here, task);
 }
 
 }  // namespace
 
 bool TaskRunner::PostTask(const tracked_objects::Location& from_here,
                           const Closure& task) {
   return PostDelayedTask(from_here, task, base::TimeDelta());
 }
 
-bool TaskRunner::PostTaskAndReply(
-    const tracked_objects::Location& from_here,
-    const Closure& task,
-    const Closure& reply) {
+bool TaskRunner::PostTaskAndReply(const tracked_objects::Location& from_here,
+                                  Closure task,
+                                  Closure reply) {
   return PostTaskAndReplyTaskRunner(this).PostTaskAndReply(
-      from_here, task, reply);
+      from_here, std::move(task), std::move(reply));
 }
 
 TaskRunner::TaskRunner() {}
 
 TaskRunner::~TaskRunner() {}
 
 void TaskRunner::OnDestruct() const {
   delete this;
 }
 
 void TaskRunnerTraits::Destruct(const TaskRunner* task_runner) {
   task_runner->OnDestruct();
 }
 
 }  // namespace base