Fix data race with synthetic delay initialization

base/debug/trace_event_synthetic_delay.cc

 // Copyright 2014 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 "base/debug/trace_event_synthetic_delay.h"
 #include "base/memory/singleton.h"
 
 namespace {
 const int kMaxSyntheticDelays = 32;
 }  // namespace
@@ skipping 202 matching lines @@
 
 ScopedSyntheticDelay::~ScopedSyntheticDelay() {
   delay_impl_->EndParallel(end_time_);
 }
 
 base::debug::TraceEventSyntheticDelay* GetOrCreateDelay(
     const char* name,
     base::subtle::AtomicWord* impl_ptr) {
   base::debug::TraceEventSyntheticDelay* delay_impl =
       reinterpret_cast<base::debug::TraceEventSyntheticDelay*>(
-          base::subtle::NoBarrier_Load(impl_ptr));
+          base::subtle::Acquire_Load(impl_ptr));
   if (!delay_impl) {
     delay_impl = base::debug::TraceEventSyntheticDelayRegistry::GetInstance()
                      ->GetOrCreateDelay(name);
-    base::subtle::NoBarrier_Store(
+    base::subtle::Release_Store(
         impl_ptr, reinterpret_cast<base::subtle::AtomicWord>(delay_impl));
   }
   return delay_impl;
 }
 
 }  // namespace trace_event_internal