c/b/supervised_user: Use range-based for where appropriate.

chrome/browser/supervised_user/supervised_user_site_list.h

 // 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.
 
 #ifndef CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SITE_LIST_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SITE_LIST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 40 matching lines @@
     // for the site.
     std::vector<std::string> hostname_hashes;
   };
 
   SupervisedUserSiteList(const std::string& extension_id,
                          const base::FilePath& path);
   ~SupervisedUserSiteList();
 
   // Creates a copy of the site list.
   // Caller takes ownership of the returned value.
-  SupervisedUserSiteList* Clone();
+  SupervisedUserSiteList* Clone() const;
 
   // Returns a list of all categories.
   // TODO(bauerb): The list is hardcoded for now, but if we allow custom
   // categories, this should live in some registry.
   static void GetCategoryNames(std::vector<base::string16>* categories);
 
   // Returns a list of all sites in this site list.
   void GetSites(std::vector<Site>* sites);
 
  private:
   bool LazyLoad();
   void CopyThumbnailUrl(const base::DictionaryValue* source,
                         base::DictionaryValue* dest);
 
   std::string extension_id_;
   base::FilePath path_;
   scoped_ptr<base::DictionaryValue> categories_;
   scoped_ptr<base::ListValue> sites_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserSiteList);
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SITE_LIST_H_