Replace scoped_ptr with std::unique_ptr in //ui

ui/base/test/scoped_preferred_scroller_style_mac.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 UI_BASE_TEST_SCOPED_PREFERRED_SCROLLER_STYLE_LEGACY_MAC_H_
 #define UI_BASE_TEST_SCOPED_PREFERRED_SCROLLER_STYLE_LEGACY_MAC_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace base {
 namespace mac {
 class ScopedObjCClassSwizzler;
 }
 }
 
 namespace ui {
 namespace test {
 
 // Overrides system setting for scrollbar style with NSScrollerOverlay if we
 // want the scrollbar to overlay. Otherwise, override with
 // NSScrollerStyleLegacy which means "always show scrollbars".
 class ScopedPreferredScrollerStyle {
  public:
   explicit ScopedPreferredScrollerStyle(bool overlay);
   ~ScopedPreferredScrollerStyle();
 
  private:
-  scoped_ptr<base::mac::ScopedObjCClassSwizzler> swizzler_;
+  std::unique_ptr<base::mac::ScopedObjCClassSwizzler> swizzler_;
 
   // True if the scrollbar style should overlay.
   bool overlay_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedPreferredScrollerStyle);
 };
 
 }  // namespace test
 }  // namespace ui
 
 #endif  // UI_BASE_TEST_SCOPED_PREFERRED_SCROLLER_STYLE_LEGACY_MAC_H_