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

chrome/browser/supervised_user/supervised_user_sync_service_unittest.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 <string>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/stringprintf.h"
@@ skipping 50 matching lines @@
 };
 
 SyncError MockChangeProcessor::ProcessSyncChanges(
     const tracked_objects::Location& from_here,
     const SyncChangeList& change_list) {
   change_list_ = change_list;
   return SyncError();
 }
 
 SyncChange MockChangeProcessor::GetChange(const std::string& id) const {
-  for (SyncChangeList::const_iterator it = change_list_.begin();
-       it != change_list_.end(); ++it) {
-    if (it->sync_data().GetSpecifics().managed_user().id() == id)
-      return *it;
+  for (const auto& sync_change : change_list_) {
+    if (sync_change.sync_data().GetSpecifics().managed_user().id() == id)
+      return sync_change;
   }
   return SyncChange();
 }
 
 // Callback for SupervisedUserSyncService::GetSupervisedUsersAsync().
 void GetSupervisedUsersCallback(const base::DictionaryValue** dict,
                                 const base::DictionaryValue* supervised_users) {
   *dict = supervised_users;
 }
 
@@ skipping 276 matching lines @@
 
   EXPECT_FALSE(SupervisedUserSyncService::GetAvatarIndex(
       "chrome-avatar-index:x",
       &avatar));
 
   EXPECT_FALSE(SupervisedUserSyncService::GetAvatarIndex(
       "chromeos-avatar-index:5",
       &avatar));
 #endif
 }