Convert //ash from scoped_ptr to std::unique_ptr

ash/accelerators/magnifier_key_scroller.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 ASH_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_
 #define ASH_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_
 
+#include <memory>
+
 #include "ash/accelerators/key_hold_detector.h"
 #include "ash/ash_export.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/events/event_handler.h"
 
 namespace ui {
 class KeyEvent;
 }
 
 namespace ash {
 
 // A KeyHoldDetector delegate to control control magnified screen.
 class ASH_EXPORT MagnifierKeyScroller : public KeyHoldDetector::Delegate {
  public:
   static bool IsEnabled();
   static void SetEnabled(bool enabled);
-  static scoped_ptr<ui::EventHandler> CreateHandler();
+  static std::unique_ptr<ui::EventHandler> CreateHandler();
 
   // A scoped object to enable and disable the magnifier accelerator for test.
   class ScopedEnablerForTest {
    public:
     ScopedEnablerForTest() {
       SetEnabled(true);
     }
     ~ScopedEnablerForTest() {
       SetEnabled(false);
     }
@@ skipping 12 matching lines @@
 
   MagnifierKeyScroller();
   ~MagnifierKeyScroller() override;
 
   DISALLOW_COPY_AND_ASSIGN(MagnifierKeyScroller);
 };
 
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_MAGNIFIER_KEY_SCROLLER_H_