Migrate WaitableEvent to enum-based constructor in ppapi/

ppapi/proxy/ppp_messaging_proxy_perftest.cc

Index: ppapi/proxy/ppp_messaging_proxy_perftest.cc
diff --git a/ppapi/proxy/ppp_messaging_proxy_perftest.cc b/ppapi/proxy/ppp_messaging_proxy_perftest.cc
index b64434341a2bd1fbec3b2c8f4c3a9c6ff8563d5b..d3998b8a17cf0fed880ea9dfc5c25c7a89904157 100644
--- a/ppapi/proxy/ppp_messaging_proxy_perftest.cc
+++ b/ppapi/proxy/ppp_messaging_proxy_perftest.cc
@@ -18,7 +18,9 @@ namespace ppapi {
 namespace proxy {
 namespace {
 
-base::WaitableEvent handle_message_called(false, false);
+base::WaitableEvent handle_message_called(
+    base::WaitableEvent::ResetPolicy::AUTOMATIC,
+    base::WaitableEvent::InitialState::NOT_SIGNALED);
 
 void HandleMessage(PP_Instance /* instance */, PP_Var message_data) {
   ppapi::ProxyAutoLock lock;