Added user settings to chrome://supervised-user-internals.

chrome/browser/supervised_user/supervised_user_settings_service.cc

Index: chrome/browser/supervised_user/supervised_user_settings_service.cc
diff --git a/chrome/browser/supervised_user/supervised_user_settings_service.cc b/chrome/browser/supervised_user/supervised_user_settings_service.cc
index 40eb8ac3def658317f9f666a9de95949246d9757..239d2914ee82b03d5dea0347c7a1470aa10f0825 100644
--- a/chrome/browser/supervised_user/supervised_user_settings_service.cc
+++ b/chrome/browser/supervised_user/supervised_user_settings_service.cc
@@ -85,14 +85,15 @@ void SupervisedUserSettingsService::Init(
   store_->AddObserver(this);
 }
 
-void SupervisedUserSettingsService::Subscribe(
+scoped_ptr<SupervisedUserSettingsService::SettingsCallbackList::Subscription>
+    SupervisedUserSettingsService::Subscribe(
     const SettingsCallback& callback) {
   if (IsReady()) {
     scoped_ptr<base::DictionaryValue> settings = GetSettings();
     callback.Run(settings.get());
   }
 
-  subscribers_.push_back(callback);
+  return callback_list_.Add(callback);
 }
 
 void SupervisedUserSettingsService::SetActive(bool active) {
@@ -406,6 +407,5 @@ void SupervisedUserSettingsService::InformSubscribers() {
     return;
 
   scoped_ptr<base::DictionaryValue> settings = GetSettings();
-  for (const auto& callback : subscribers_)
-    callback.Run(settings.get());
+  callback_list_.Notify(settings.get());
 }