Replace scoped_ptr with std::unique_ptr in //ui

ui/app_list/search/history.cc

 // Copyright 2013 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/app_list/search/history.h"
 
 #include <stddef.h>
 
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 31 matching lines @@
 bool History::IsReady() const {
   return data_loaded_;
 }
 
 void History::AddLaunchEvent(const std::string& query,
                              const std::string& result_id) {
   DCHECK(IsReady());
   data_->Add(NormalizeString(query), result_id);
 }
 
-scoped_ptr<KnownResults> History::GetKnownResults(
+std::unique_ptr<KnownResults> History::GetKnownResults(
     const std::string& query) const {
   DCHECK(IsReady());
   return data_->GetKnownResults(NormalizeString(query));
 }
 
 void History::OnHistoryDataLoadedFromStore() {
   data_loaded_ = true;
 }
 
 }  // namespace app_list