Change const TimeDelta& to TimeDelta in base/task_scheduler/.

base/task_scheduler/scheduler_worker.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 BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_
 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_
 
 #include <memory>
 
 #include "base/base_export.h"
@@ skipping 39 matching lines @@
     virtual void OnMainEntry(SchedulerWorker* worker) = 0;
 
     // Called by a thread managed by |worker| to get a Sequence from which to
     // run a Task.
     virtual scoped_refptr<Sequence> GetWork(SchedulerWorker* worker) = 0;
 
     // Called by the SchedulerWorker after it ran a task with |task_priority|.
     // |task_latency| is the time elapsed between when the task was posted and
     // when it started to run.
     virtual void DidRunTaskWithPriority(TaskPriority task_priority,
-                                        const TimeDelta& task_latency) = 0;
+                                        TimeDelta task_latency) = 0;
 
     // Called when |sequence| isn't empty after the SchedulerWorker pops a Task
     // from it. |sequence| is the last Sequence returned by GetWork().
     virtual void ReEnqueueSequence(scoped_refptr<Sequence> sequence) = 0;
 
     // Called by a thread to determine how long to sleep before the next call to
     // GetWork(). GetWork() may be called before this timeout expires if the
     // worker's WakeUp() method is called.
     virtual TimeDelta GetSleepTimeout() = 0;
 
@@ skipping 83 matching lines @@
   // Set once JoinForTesting() has been called.
   AtomicFlag should_exit_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerWorker);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_H_