Add default constructor for rtc::Event

Bug: webrtc:9962
Change-Id: Icaa91e657e6881fcb1553f354c07866109a0ea68
Reviewed-on: https://webrtc-review.googlesource.com/c/109500
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25535}
diff --git a/rtc_base/timeutils_unittest.cc b/rtc_base/timeutils_unittest.cc
index 0e1949a..577efda 100644
--- a/rtc_base/timeutils_unittest.cc
+++ b/rtc_base/timeutils_unittest.cc
@@ -262,7 +262,7 @@
   worker->Start();
 
   // Post an event that won't be executed for 10 seconds.
-  Event message_handler_dispatched(false, false);
+  Event message_handler_dispatched;
   auto functor = [&message_handler_dispatched] {
     message_handler_dispatched.Set();
   };