[Extensions] Convert some SyncExtensionFunctions

extensions/browser/api/power/power_api.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 "extensions/browser/api/power/power_api.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "content/public/browser/browser_thread.h"
 #include "device/power_save_blocker/power_save_blocker.h"
@@ skipping 28 matching lines @@
     device::PowerSaveBlocker::Reason reason,
     const std::string& description,
     scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> file_task_runner) {
   return std::unique_ptr<device::PowerSaveBlocker>(new device::PowerSaveBlocker(
       type, reason, description, ui_task_runner, file_task_runner));
 }
 
 }  // namespace
 
-bool PowerRequestKeepAwakeFunction::RunSync() {
+ExtensionFunction::ResponseAction PowerRequestKeepAwakeFunction::Run() {
   std::unique_ptr<api::power::RequestKeepAwake::Params> params(
       api::power::RequestKeepAwake::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params);
-  EXTENSION_FUNCTION_VALIDATE(params->level != api::power::LEVEL_NONE);
   PowerAPI::Get(browser_context())->AddRequest(extension_id(), params->level);
-  return true;
+  return RespondNow(NoArguments());
 }
 
-bool PowerReleaseKeepAwakeFunction::RunSync() {
+ExtensionFunction::ResponseAction PowerReleaseKeepAwakeFunction::Run() {
   PowerAPI::Get(browser_context())->RemoveRequest(extension_id());
-  return true;
+  return RespondNow(NoArguments());
 }
 
 // static
 PowerAPI* PowerAPI::Get(content::BrowserContext* context) {
   return BrowserContextKeyedAPIFactory<PowerAPI>::Get(context);
 }
 
 // static
 BrowserContextKeyedAPIFactory<PowerAPI>* PowerAPI::GetFactoryInstance() {
   return g_factory.Pointer();
@@ skipping 66 matching lines @@
 }
 
 void PowerAPI::Shutdown() {
   // Unregister here rather than in the d'tor; otherwise this call will recreate
   // the already-deleted ExtensionRegistry.
   ExtensionRegistry::Get(browser_context_)->RemoveObserver(this);
   power_save_blocker_.reset();
 }
 
 }  // namespace extensions