[Extensions] Convert some SyncExtensionFunctions

extensions/browser/api/power/power_api.cc

Index: extensions/browser/api/power/power_api.cc
diff --git a/extensions/browser/api/power/power_api.cc b/extensions/browser/api/power/power_api.cc
index 9272bfcf570537837d36f0ce67bd12ca0db807a8..b2642df842df5d234807da18158e023fc28460b2 100644
--- a/extensions/browser/api/power/power_api.cc
+++ b/extensions/browser/api/power/power_api.cc
@@ -46,18 +46,17 @@ std::unique_ptr<device::PowerSaveBlocker> CreatePowerSaveBlocker(
 
 }  // 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