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/criticalsection_unittest.cc b/rtc_base/criticalsection_unittest.cc
index db4f9e7..6016f85 100644
--- a/rtc_base/criticalsection_unittest.cc
+++ b/rtc_base/criticalsection_unittest.cc
@@ -389,7 +389,7 @@
 // The test is disabled by default to avoid unecessarily loading the bots.
 TEST(CriticalSectionTest, DISABLED_Performance) {
   PerfTestThread threads[8];
-  Event event(false, false);
+  Event event;
 
   static const int kThreadRepeats = 10000000;
   static const int kExpectedCount = kThreadRepeats * arraysize(threads);