Enable child account detection by default

chrome/browser/supervised_user/child_accounts/child_account_service.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/child_accounts/child_account_service.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 74 matching lines @@
   // UMA reports the correct group.
   const std::string group_name =
       base::FieldTrialList::FindFullName(kChildAccountDetectionFieldTrialName);
 
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kDisableChildAccountDetection))
     return false;
   if (command_line->HasSwitch(switches::kEnableChildAccountDetection))
     return true;
 
-  return group_name == "Enabled";
+  if (group_name == "Disabled")
+    return false;
+  return true;
 }
 
 void ChildAccountService::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kChildAccountStatusKnown,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
@@ skipping 331 matching lines @@
     command_line->AppendSwitch(switches::kEnableSupervisedUserBlacklist);
 
   // Query-based filtering also defaults to enabled.
   bool has_enable_safesites =
       command_line->HasSwitch(switches::kEnableSupervisedUserSafeSites);
   bool has_disable_safesites =
       command_line->HasSwitch(switches::kDisableSupervisedUserSafeSites);
   if (!has_enable_safesites && !has_disable_safesites)
     command_line->AppendSwitch(switches::kEnableSupervisedUserSafeSites);
 }