[Extensions] Convert APIs to use movable types [9]

chrome/browser/extensions/api/settings_private/settings_private_event_router.cc

 // Copyright 2015 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/extensions/api/settings_private/settings_private_event_router.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 113 matching lines @@
 }
 
 void SettingsPrivateEventRouter::OnPreferenceChanged(
     const std::string& pref_name) {
   EventRouter* event_router = EventRouter::Get(context_);
   if (!event_router->HasEventListener(
           api::settings_private::OnPrefsChanged::kEventName)) {
     return;
   }
 
-  api::settings_private::PrefObject* pref_object =
-      prefs_util_->GetPref(pref_name).release();
+  scoped_ptr<api::settings_private::PrefObject> pref_object =
+      prefs_util_->GetPref(pref_name);
 
-  std::vector<linked_ptr<api::settings_private::PrefObject>> prefs;
-  prefs.push_back(linked_ptr<api::settings_private::PrefObject>(pref_object));
+  std::vector<api::settings_private::PrefObject> prefs;
+  if (pref_object)
+    prefs.push_back(std::move(*pref_object));
 
   scoped_ptr<base::ListValue> args(
       api::settings_private::OnPrefsChanged::Create(prefs));
 
   scoped_ptr<Event> extension_event(new Event(
       events::SETTINGS_PRIVATE_ON_PREFS_CHANGED,
       api::settings_private::OnPrefsChanged::kEventName, std::move(args)));
   event_router->BroadcastEvent(std::move(extension_event));
 }
 
 SettingsPrivateEventRouter* SettingsPrivateEventRouter::Create(
     content::BrowserContext* context) {
   return new SettingsPrivateEventRouter(context);
 }
 
 }  // namespace extensions