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

base/test/test_pending_task.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 BASE_TEST_TEST_PENDING_TASK_H_
 #define BASE_TEST_TEST_PENDING_TASK_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/time/time.h"
 #include "base/trace_event/trace_event_argument.h"
 
 namespace base {
 
 // TestPendingTask is a helper class for test TaskRunner
 // implementations.  See test_simple_task_runner.h for example usage.
 
 struct TestPendingTask {
   enum TestNestability { NESTABLE, NON_NESTABLE };
 
   TestPendingTask();
   TestPendingTask(TestPendingTask&& other);
   TestPendingTask(const tracked_objects::Location& location,
-                  const Closure& task,
+                  Closure task,
                   TimeTicks post_time,
                   TimeDelta delay,
                   TestNestability nestability);
   ~TestPendingTask();
 
   TestPendingTask& operator=(TestPendingTask&& other);
 
   // Returns post_time + delay.
   TimeTicks GetTimeToRun() const;
 
@@ skipping 32 matching lines @@
 };
 
 // gtest helpers which allow pretty printing of the tasks, very useful in unit
 // testing.
 std::ostream& operator<<(std::ostream& os, const TestPendingTask& task);
 void PrintTo(const TestPendingTask& task, std::ostream* os);
 
 }  // namespace base
 
 #endif  // BASE_TEST_TEST_PENDING_TASK_H_