Rename "NoBarrier" memory operations to "Relaxed".

src/heap/concurrent-marking.cc

Index: src/heap/concurrent-marking.cc
diff --git a/src/heap/concurrent-marking.cc b/src/heap/concurrent-marking.cc
index f541828e290bf5a77979d70066ee91b2b618e0b3..8ff7be3f06246373d44afdeddc1ce1916fde20ef 100644
--- a/src/heap/concurrent-marking.cc
+++ b/src/heap/concurrent-marking.cc
@@ -59,7 +59,7 @@ class ConcurrentMarkingVisitor final
   void VisitPointers(HeapObject* host, Object** start, Object** end) override {
     for (Object** p = start; p < end; p++) {
       Object* object = reinterpret_cast<Object*>(
-          base::NoBarrier_Load(reinterpret_cast<const base::AtomicWord*>(p)));
+          base::Relaxed_Load(reinterpret_cast<const base::AtomicWord*>(p)));
       if (!object->IsHeapObject()) continue;
       MarkObject(HeapObject::cast(object));
     }
@@ -183,7 +183,7 @@ class ConcurrentMarkingVisitor final
                        Object** end) override {
       for (Object** p = start; p < end; p++) {
         Object* object = reinterpret_cast<Object*>(
-            base::NoBarrier_Load(reinterpret_cast<const base::AtomicWord*>(p)));
+            base::Relaxed_Load(reinterpret_cast<const base::AtomicWord*>(p)));
         slot_snapshot_->add(p, object);
       }
     }