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

chrome/browser/supervised_user/supervised_user_pref_store.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 "chrome/browser/supervised_user/supervised_user_pref_store.h"
 
+#include <vector>
+
 #include "base/bind.h"
 #include "base/prefs/pref_value_map.h"
 #include "base/values.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/supervised_user/supervised_user_constants.h"
 #include "chrome/browser/supervised_user/supervised_user_settings_service.h"
 #include "chrome/browser/supervised_user/supervised_user_url_filter.h"
 #include "chrome/common/pref_names.h"
 
 using base::FundamentalValue;
@@ skipping 95 matching lines @@
 
   if (!old_prefs) {
     FOR_EACH_OBSERVER(Observer, observers_, OnInitializationCompleted(true));
     return;
   }
 
   std::vector<std::string> changed_prefs;
   prefs_->GetDifferingKeys(old_prefs.get(), &changed_prefs);
 
   // Send out change notifications.
-  for (std::vector<std::string>::const_iterator pref(changed_prefs.begin());
-       pref != changed_prefs.end();
-       ++pref) {
-    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(*pref));
-  }
+  for (const auto& pref : changed_prefs)
+    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(pref));
 }