Rename "NoBarrier" memory operations to "Relaxed".

src/libplatform/tracing/tracing-controller.cc

 // Copyright 2016 the V8 project 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 <stdio.h>
 #include <string.h>
 
 #include "include/libplatform/v8-tracing.h"
 
 #include "src/base/platform/mutex.h"
@@ skipping 126 matching lines @@
   // to guarantee that metadata events are always added even if the category
   // filter is "-*". See crbug.com/618054 for more details and long-term fix.
   if (mode_ == RECORDING_MODE && !strcmp(category_group, "__metadata")) {
     enabled_flag |= ENABLED_FOR_RECORDING;
   }
 
   g_category_group_enabled[category_index] = enabled_flag;
 }
 
 void TracingController::UpdateCategoryGroupEnabledFlags() {
-  size_t category_index = base::NoBarrier_Load(&g_category_index);
+  size_t category_index = base::Relaxed_Load(&g_category_index);
   for (size_t i = 0; i < category_index; i++) UpdateCategoryGroupEnabledFlag(i);
 }
 
 const uint8_t* TracingController::GetCategoryGroupEnabledInternal(
     const char* category_group) {
   // Check that category groups does not contain double quote
   DCHECK(!strchr(category_group, '"'));
 
   // The g_category_groups is append only, avoid using a lock for the fast path.
   size_t current_category_index = v8::base::Acquire_Load(&g_category_index);
@@ skipping 51 matching lines @@
 void TracingController::RemoveTraceStateObserver(
     Platform::TraceStateObserver* observer) {
   base::LockGuard<base::Mutex> lock(mutex_.get());
   DCHECK(observers_.find(observer) != observers_.end());
   observers_.erase(observer);
 }
 
 }  // namespace tracing
 }  // namespace platform
 }  // namespace v8