Migrate WaitableEvent to enum-based constructor in content/

content/child/fileapi/webfilewriter_impl.cc

Index: content/child/fileapi/webfilewriter_impl.cc
diff --git a/content/child/fileapi/webfilewriter_impl.cc b/content/child/fileapi/webfilewriter_impl.cc
index 8ec97332d183ad4091888c496501ca41a43f9faa..a2f8d92f89df126629e569c4397e698b84e20fb3 100644
--- a/content/child/fileapi/webfilewriter_impl.cc
+++ b/content/child/fileapi/webfilewriter_impl.cc
@@ -36,8 +36,11 @@ class WebFileWriterImpl::WriterBridge
         task_runner_(running_on_worker_ ? base::ThreadTaskRunnerHandle::Get()
                                         : nullptr),
         written_bytes_(0) {
-    if (type == WebFileWriterImpl::TYPE_SYNC)
-      waitable_event_.reset(new base::WaitableEvent(false, false));
+    if (type == WebFileWriterImpl::TYPE_SYNC) {
+      waitable_event_.reset(new base::WaitableEvent(
+          base::WaitableEvent::ResetPolicy::AUTOMATIC,
+          base::WaitableEvent::InitialState::NOT_SIGNALED));
+    }
   }
 
   void Truncate(const GURL& path,