Use std::move() instead of .Pass() in remoting/host

remoting/host/backoff_timer.h

 // Copyright 2015 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 REMOTING_HOST_BACKOFF_TIMER_H_
 #define REMOTING_HOST_BACKOFF_TIMER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 15 matching lines @@
              base::TimeDelta delay,
              base::TimeDelta max_delay,
              const base::Closure& user_task);
 
   // Prevents the user task from being invoked again.
   void Stop();
 
   // Returns true if the user task may be invoked in the future.
   bool IsRunning() const { return backoff_entry_; }
 
-  void SetTimerForTest(scoped_ptr<base::Timer> timer) { timer_ = timer.Pass(); }
+  void SetTimerForTest(scoped_ptr<base::Timer> timer);
 
  private:
   void StartTimer();
   void OnTimerFired();
 
   scoped_ptr<base::Timer> timer_;
   base::Closure user_task_;
   tracked_objects::Location posted_from_;
   net::BackoffEntry::Policy backoff_policy_ = {};
   scoped_ptr<net::BackoffEntry> backoff_entry_;
 
   DISALLOW_COPY_AND_ASSIGN(BackoffTimer);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_BACKOFF_TIMER_H_