Revert "EDK: Move //mojo/edk/system/waitable_event* to edk/util."

mojo/edk/system/test/test_io_thread.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/system/test/test_io_thread.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
-#include "mojo/edk/util/waitable_event.h"
-
-using mojo::util::AutoResetWaitableEvent;
+#include "base/synchronization/waitable_event.h"
 
 namespace mojo {
 namespace system {
 namespace test {
 
 namespace {
 
-void PostTaskAndWaitHelper(AutoResetWaitableEvent* event,
+void PostTaskAndWaitHelper(base::WaitableEvent* event,
                            const base::Closure& task) {
   task.Run();
   event->Signal();
 }
 
 }  // namespace
 
 TestIOThread::TestIOThread(StartMode start_mode)
     : io_thread_("test_io_thread"), io_thread_started_(false) {
   switch (start_mode) {
@@ skipping 21 matching lines @@
   // Note: It's okay to call |Stop()| even if the thread isn't running.
   io_thread_.Stop();
   io_thread_started_ = false;
 }
 
 void TestIOThread::PostTask(const base::Closure& task) {
   task_runner()->PostTask(tracked_objects::Location(), task);
 }
 
 void TestIOThread::PostTaskAndWait(const base::Closure& task) {
-  AutoResetWaitableEvent event;
+  base::WaitableEvent event(false, false);
   task_runner()->PostTask(tracked_objects::Location(),
                           base::Bind(&PostTaskAndWaitHelper, &event, task));
   event.Wait();
 }
 
 }  // namespace test
 }  // namespace system
 }  // namespace mojo