Rename "NoBarrier" memory operations to "Relaxed".

src/tracing/trace-event.h

Index: src/tracing/trace-event.h
diff --git a/src/tracing/trace-event.h b/src/tracing/trace-event.h
index 8fbd56f6b5de23f2c983bf0da09c3541c7265a7c..ee8890707bd3c4f2d00e6132519d5588c70f79a2 100644
--- a/src/tracing/trace-event.h
+++ b/src/tracing/trace-event.h
@@ -107,9 +107,9 @@ enum CategoryGroupEnabledFlags {
 
 // Defines atomic operations used internally by the tracing system.
 #define TRACE_EVENT_API_ATOMIC_WORD v8::base::AtomicWord
-#define TRACE_EVENT_API_ATOMIC_LOAD(var) v8::base::NoBarrier_Load(&(var))
+#define TRACE_EVENT_API_ATOMIC_LOAD(var) v8::base::Relaxed_Load(&(var))
 #define TRACE_EVENT_API_ATOMIC_STORE(var, value) \
-  v8::base::NoBarrier_Store(&(var), (value))
+  v8::base::Relaxed_Store(&(var), (value))
 
 ////////////////////////////////////////////////////////////////////////////////