Rename "NoBarrier" memory operations to "Relaxed".

src/heap/objects-visiting.h

Index: src/heap/objects-visiting.h
diff --git a/src/heap/objects-visiting.h b/src/heap/objects-visiting.h
index 91e751a674bca55b021bc01d5d38df53f1175fe8..97bdcdc396f51ef785e035a04e9e18be9e8fe0e2 100644
--- a/src/heap/objects-visiting.h
+++ b/src/heap/objects-visiting.h
@@ -100,7 +100,7 @@ class VisitorDispatchTable {
     // every element of callbacks_ array will remain correct
     // pointer (memcpy might be implemented as a byte copying loop).
     for (int i = 0; i < kVisitorIdCount; i++) {
-      base::NoBarrier_Store(&callbacks_[i], other->callbacks_[i]);
+      base::Relaxed_Store(&callbacks_[i], other->callbacks_[i]);
     }
   }