Use Chrome compatible naming for compiler specifics.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9fa6bd791747cccbeffb000223a9ab4c42386ce3..730e56d5f01b258a2706ea29fbdc97b3281fbda4 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -6342,10 +6342,10 @@ class Map: public HeapObject {
   // is found by re-transitioning from the root of the transition tree using the
   // descriptor array of the map. Returns NULL if no updated map is found.
   // This method also applies any pending migrations along the prototype chain.
-  static MaybeHandle<Map> TryUpdate(Handle<Map> map) V8_WARN_UNUSED_RESULT;
+  static MaybeHandle<Map> TryUpdate(Handle<Map> map) WARN_UNUSED_RESULT;
   // Same as above, but does not touch the prototype chain.
   static MaybeHandle<Map> TryUpdateInternal(Handle<Map> map)
-      V8_WARN_UNUSED_RESULT;
+      WARN_UNUSED_RESULT;
 
   // Returns a non-deprecated version of the input. This method may deprecate
   // existing maps along the way if encodings conflict. Not for use while