Replace scoped_ptr with std::unique_ptr in //ui

ui/ozone/common/stub_overlay_manager.cc

 // 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.
 
 #include "ui/ozone/common/stub_overlay_manager.h"
 #include "ui/ozone/public/overlay_candidates_ozone.h"
 
 namespace ui {
 
 StubOverlayManager::StubOverlayManager() {
 }
 
 StubOverlayManager::~StubOverlayManager() {
 }
 
-scoped_ptr<OverlayCandidatesOzone> StubOverlayManager::CreateOverlayCandidates(
-    gfx::AcceleratedWidget w) {
+std::unique_ptr<OverlayCandidatesOzone>
+StubOverlayManager::CreateOverlayCandidates(gfx::AcceleratedWidget w) {
   return nullptr;
 }
 
 }  // namespace ui