Migrate WaitableEvent to enum-based constructor in read_write_lock_unittest.cc

base/synchronization/read_write_lock_unittest.cc

Index: base/synchronization/read_write_lock_unittest.cc
diff --git a/base/synchronization/read_write_lock_unittest.cc b/base/synchronization/read_write_lock_unittest.cc
index bae3ce98ab5b73c6013e0e2e442a3ce0fd1f2aad..d1acaf25449d48441917641894a379e4ddc2a79d 100644
--- a/base/synchronization/read_write_lock_unittest.cc
+++ b/base/synchronization/read_write_lock_unittest.cc
@@ -109,8 +109,10 @@ TEST(ReadWriteLockTest, ReaderTwoThreads) {
 class ReadAndWriteReadWriteLockTestThread : public PlatformThread::Delegate {
  public:
   ReadAndWriteReadWriteLockTestThread(ReadWriteLock* lock, int* value)
-      : lock_(lock), value_(value),
-        event_(true /* manual_reset */, false /* initially_signaled */)  {}
+      : lock_(lock),
+        value_(value),
+        event_(WaitableEvent::ResetPolicy::MANUAL,
+               WaitableEvent::InitialState::NOT_SIGNALED) {}
 
   void ThreadMain() override {
     AutoWriteLock locker(*lock_);