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

extensions/browser/api/device_permissions_manager.cc

 // Copyright 2014 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 "extensions/browser/api/device_permissions_manager.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 234 matching lines @@
 // Returns all DevicePermissionEntries for the app.
 std::set<scoped_refptr<DevicePermissionEntry>> GetDevicePermissionEntries(
     ExtensionPrefs* prefs,
     const std::string& extension_id) {
   std::set<scoped_refptr<DevicePermissionEntry>> result;
   const base::ListValue* devices = NULL;
   if (!prefs->ReadPrefAsList(extension_id, kDevices, &devices)) {
     return result;
   }
 
-  for (const base::Value* entry : *devices) {
+  for (const auto& entry : *devices) {
     const base::DictionaryValue* entry_dict;
     if (entry->GetAsDictionary(&entry_dict)) {
       scoped_refptr<DevicePermissionEntry> device_entry =
           ReadDevicePermissionEntry(entry_dict);
       if (entry_dict) {
         result.insert(device_entry);
       }
     }
   }
   return result;
@@ skipping 458 matching lines @@
 
 BrowserContext* DevicePermissionsManagerFactory::GetBrowserContextToUse(
     BrowserContext* context) const {
   // Return the original (possibly off-the-record) browser context so that a
   // separate instance of the DevicePermissionsManager is used in incognito
   // mode. The parent class's implemenation returns NULL.
   return context;
 }
 
 }  // namespace extensions