Use std::unique_ptr for base::DictionaryValue and base::ListValue's internal store.

chrome/common/extensions/manifest_handlers/linked_app_icons.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 "chrome/common/extensions/manifest_handlers/linked_app_icons.h"
 
 #include <memory>
 
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 50 matching lines @@
 
   const base::Value* icons_value = nullptr;
   const base::ListValue* icons_list = nullptr;
   if (extension->manifest()->Get(keys::kLinkedAppIcons, &icons_value)) {
     if (!icons_value->GetAsList(&icons_list)) {
       *error = base::UTF8ToUTF16(
           extensions::manifest_errors::kInvalidLinkedAppIcons);
       return false;
     }
 
-    for (const base::Value* icon_value : *icons_list) {
+    for (const auto& icon_value : *icons_list) {
       const base::DictionaryValue* icon_dict = nullptr;
       if (!icon_value->GetAsDictionary(&icon_dict)) {
         *error = base::UTF8ToUTF16(
             extensions::manifest_errors::kInvalidLinkedAppIcon);
         return false;
       }
 
       std::string url_string;
       if (!icon_dict->GetString(keys::kLinkedAppIconURL, &url_string)) {
         *error = base::UTF8ToUTF16(
@@ skipping 21 matching lines @@
 
   extension->SetManifestData(keys::kLinkedAppIcons, linked_app_icons.release());
   return true;
 }
 
 const std::vector<std::string> LinkedAppIconsHandler::Keys() const {
   return SingleKey(keys::kLinkedAppIcons);
 }
 
 }  // namespace extensions