Migrate WaitableEvent to enum-based constructor in net/

Change automated with clang-tidy (details @ https://crbug.com/612843#c13)

BUG=612843

Review-Url: https://codereview.chromium.org/2030663002
Cr-Commit-Position: refs/heads/master@{#397382}
diff --git a/net/dns/serial_worker_unittest.cc b/net/dns/serial_worker_unittest.cc
index 7a1b56f7..89fdb21 100644
--- a/net/dns/serial_worker_unittest.cc
+++ b/net/dns/serial_worker_unittest.cc
@@ -82,10 +82,11 @@
   SerialWorkerTest()
       : input_value_(0),
         output_value_(-1),
-        work_allowed_(false, false),
-        work_called_(false, false),
-        work_running_(false) {
-  }
+        work_allowed_(base::WaitableEvent::ResetPolicy::AUTOMATIC,
+                      base::WaitableEvent::InitialState::NOT_SIGNALED),
+        work_called_(base::WaitableEvent::ResetPolicy::AUTOMATIC,
+                     base::WaitableEvent::InitialState::NOT_SIGNALED),
+        work_running_(false) {}
 
   // Helpers for tests.