Fix IWYU violators that don't include scoped_ptr.h in CrOS build.

components/timers/alarm_timer_chromeos.h

 // Copyright 2014 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 COMPONENTS_TIMERS_ALARM_TIMER_CHROMEOS_H_
 #define COMPONENTS_TIMERS_ALARM_TIMER_CHROMEOS_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 
 namespace base {
 class MessageLoop;
 struct PendingTask;
 }
 
 namespace timers {
@@ skipping 116 matching lines @@
   SimpleAlarmTimer(const tracked_objects::Location& posted_from,
                    base::TimeDelta delay,
                    const base::Closure& user_task);
 
   ~SimpleAlarmTimer() override;
 };
 
 }  // namespace timers
 
 #endif  // COMPONENTS_TIMERS_ALARM_TIMER_CHROMEOS_H_