base: Remove some unnecessary const scoped_refptr<>&.

base/deferred_sequenced_task_runner.h

 // Copyright (c) 2013 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_DEFERRED_SEQUENCED_TASK_RUNNER_H_
 #define BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_
 
 #include <vector>
 
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "base/tracked_objects.h"
 
 namespace base {
 
 // A DeferredSequencedTaskRunner is a subclass of SequencedTaskRunner that
 // queues up all requests until the first call to Start() is issued.
 class BASE_EXPORT DeferredSequencedTaskRunner : public SequencedTaskRunner {
  public:
   explicit DeferredSequencedTaskRunner(
-      const scoped_refptr<SequencedTaskRunner>& target_runner);
+      scoped_refptr<SequencedTaskRunner> target_runner);
 
   // TaskRunner implementation
   bool PostDelayedTask(const tracked_objects::Location& from_here,
                        const Closure& task,
                        TimeDelta delay) override;
   bool RunsTasksOnCurrentThread() const override;
 
   // SequencedTaskRunner implementation
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
                                   const Closure& task,
@@ skipping 32 matching lines @@
   bool started_;
   const scoped_refptr<SequencedTaskRunner> target_task_runner_;
   std::vector<DeferredTask> deferred_tasks_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(DeferredSequencedTaskRunner);
 };
 
 }  // namespace base
 
 #endif  // BASE_DEFERRED_SEQUENCED_TASK_RUNNER_H_