Migrate WaitableEvent to enum-based constructor in ppapi/nacl_irt

ppapi/nacl_irt/manifest_service.cc

Index: ppapi/nacl_irt/manifest_service.cc
diff --git a/ppapi/nacl_irt/manifest_service.cc b/ppapi/nacl_irt/manifest_service.cc
index 030cc4a9634719832160846a8021fd9d72fdfacf..f045dbcb70428983b19bdc06f71a1a418ec20957 100644
--- a/ppapi/nacl_irt/manifest_service.cc
+++ b/ppapi/nacl_irt/manifest_service.cc
@@ -34,9 +34,8 @@ class ManifestMessageFilter : public IPC::SyncMessageFilter {
   ManifestMessageFilter(base::WaitableEvent* shutdown_event)
       : SyncMessageFilter(shutdown_event,
                           false /* is_channel_send_thread_safe */),
-        connected_event_(
-            true /* manual_reset */, false /* initially_signaled */) {
-  }
+        connected_event_(base::WaitableEvent::ResetPolicy::MANUAL,
+                         base::WaitableEvent::InitialState::NOT_SIGNALED) {}
 
   bool Send(IPC::Message* message) override {
     // Wait until set up is actually done.