Migrate WaitableEvent to enum-based constructor in base/

base/threading/worker_pool_unittest.cc

Index: base/threading/worker_pool_unittest.cc
diff --git a/base/threading/worker_pool_unittest.cc b/base/threading/worker_pool_unittest.cc
index 27af50be6781810f08e5e836fb3babbe0983c8d2..ef4bed136e95357ac52b6426c74dcfe00a03c715 100644
--- a/base/threading/worker_pool_unittest.cc
+++ b/base/threading/worker_pool_unittest.cc
@@ -26,7 +26,10 @@ namespace {
 class PostTaskAndReplyTester
     : public base::RefCountedThreadSafe<PostTaskAndReplyTester> {
  public:
-  PostTaskAndReplyTester() : finished_(false), test_event_(false, false) {}
+  PostTaskAndReplyTester()
+      : finished_(false),
+        test_event_(WaitableEvent::ResetPolicy::AUTOMATIC,
+                    WaitableEvent::InitialState::NOT_SIGNALED) {}
 
   void RunTest() {
     ASSERT_TRUE(thread_checker_.CalledOnValidThread());
@@ -69,8 +72,10 @@ class PostTaskAndReplyTester
 }  // namespace
 
 TEST_F(WorkerPoolTest, PostTask) {
-  WaitableEvent test_event(false, false);
-  WaitableEvent long_test_event(false, false);
+  WaitableEvent test_event(WaitableEvent::ResetPolicy::AUTOMATIC,
+                           WaitableEvent::InitialState::NOT_SIGNALED);
+  WaitableEvent long_test_event(WaitableEvent::ResetPolicy::AUTOMATIC,
+                                WaitableEvent::InitialState::NOT_SIGNALED);
 
   WorkerPool::PostTask(FROM_HERE,
                        base::Bind(&WaitableEvent::Signal,