Change more base::ListValue methods to use std::unique_ptr.

components/error_page/common/localized_error.cc

 // Copyright (c) 2012 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 "components/error_page/common/localized_error.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 487 matching lines @@
     }
   }
 }
 
 // Helper function that creates a single entry dictionary and adds it
 // to a ListValue,
 void AddSingleEntryDictionaryToList(base::ListValue* list,
                                     const char* path,
                                     int message_id,
                                     bool insert_as_first_item) {
-  std::unique_ptr<base::DictionaryValue> suggestion_list_item(
-      new base::DictionaryValue);
+  auto suggestion_list_item = base::MakeUnique<base::DictionaryValue>();
   suggestion_list_item->SetString(path, l10n_util::GetStringUTF16(message_id));
 
   if (insert_as_first_item) {
-    list->Insert(0, suggestion_list_item.release());
+    list->Insert(0, std::move(suggestion_list_item));
   } else {
     list->Append(std::move(suggestion_list_item));
   }
 }
 
 // Adds a linked suggestion dictionary entry to the suggestions list.
 void AddLinkedSuggestionToList(const int error_code,
                                const std::string& locale,
                                base::ListValue* suggestions_summary_list,
                                bool standalone_suggestion) {
@@ skipping 494 matching lines @@
 
 bool LocalizedError::HasStrings(const std::string& error_domain,
                                 int error_code) {
   // Whether or not the there are strings for an error does not depend on
   // whether or not the page was be generated by a POST, so just claim it was
   // not.
   return LookupErrorMap(error_domain, error_code, /*is_post=*/false) != nullptr;
 }
 
 }  // namespace error_page