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

chrome/browser/ui/webui/site_settings_helper.cc

 // 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.
 
 #include "chrome/browser/ui/webui/site_settings_helper.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
@@ skipping 131 matching lines @@
          type == CONTENT_SETTINGS_TYPE_MEDIASTREAM_CAMERA);
 
   PrefService* prefs = Profile::FromWebUI(web_ui)->GetPrefs();
   const base::ListValue* policy_urls = prefs->GetList(
       type == CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC
           ? prefs::kAudioCaptureAllowedUrls
           : prefs::kVideoCaptureAllowedUrls);
 
   // Convert the URLs to |ContentSettingsPattern|s. Ignore any invalid ones.
   std::vector<ContentSettingsPattern> patterns;
-  for (const base::Value* entry : *policy_urls) {
+  for (const auto& entry : *policy_urls) {
     std::string url;
     bool valid_string = entry->GetAsString(&url);
     if (!valid_string)
       continue;
 
     ContentSettingsPattern pattern = ContentSettingsPattern::FromString(url);
     if (!pattern.IsValid())
       continue;
 
     patterns.push_back(pattern);
   }
 
   // The patterns are shown in the UI in a reverse order defined by
   // |ContentSettingsPattern::operator<|.
   std::sort(
       patterns.begin(), patterns.end(), std::greater<ContentSettingsPattern>());
 
   for (const ContentSettingsPattern& pattern : patterns) {
     exceptions->push_back(GetExceptionForPage(pattern, ContentSettingsPattern(),
                                               CONTENT_SETTING_ALLOW,
                                               kPolicyProviderId));
   }
 }
 
 }  // namespace site_settings