Migrate WaitableEvent to enum-based constructor in components/

components/prefs/pref_member_unittest.cc

Index: components/prefs/pref_member_unittest.cc
diff --git a/components/prefs/pref_member_unittest.cc b/components/prefs/pref_member_unittest.cc
index 73b6ed00c867be4c6af686ff5437d96d3a56e6c2..dc7ef161d5c1779b6d56a5aaa02f170634f7c7ab 100644
--- a/components/prefs/pref_member_unittest.cc
+++ b/components/prefs/pref_member_unittest.cc
@@ -46,7 +46,8 @@ class GetPrefValueHelper
   }
 
   void FetchValue() {
-    base::WaitableEvent event(true, false);
+    base::WaitableEvent event(base::WaitableEvent::ResetPolicy::MANUAL,
+                              base::WaitableEvent::InitialState::NOT_SIGNALED);
     ASSERT_TRUE(pref_thread_.task_runner()->PostTask(
         FROM_HERE,
         base::Bind(&GetPrefValueHelper::GetPrefValue, this, &event)));