Replace scoped_ptr with std::unique_ptr in //ui

ui/views/test/platform_test_helper.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_VIEWS_TEST_PLATFORM_TEST_HELPER_H_
 #define UI_VIEWS_TEST_PLATFORM_TEST_HELPER_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 namespace views {
 
 class PlatformTestHelper {
  public:
   PlatformTestHelper() {}
   virtual ~PlatformTestHelper() {}
 
-  static scoped_ptr<PlatformTestHelper> Create();
+  static std::unique_ptr<PlatformTestHelper> Create();
 
   virtual bool IsMus() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PlatformTestHelper);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_PLATFORM_TEST_HELPER_H_