Restructure Object::SetProperty and related functions.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 3530b59def0323b2930d547331c7cca76135e2fc..1ed2fd125315eea8ca4af113cab5a668ad25cb3c 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1585,7 +1585,7 @@ BUILTIN(ReflectPreventExtensions) {
   }
 
   Maybe<bool> result = JSReceiver::PreventExtensions(
-      Handle<JSReceiver>::cast(target), DONT_THROW);
+      Handle<JSReceiver>::cast(target), Object::DONT_THROW);
   return result.IsJust() ? *isolate->factory()->ToBoolean(result.FromJust())
                          : isolate->heap()->exception();
 }
@@ -1611,7 +1611,7 @@ BUILTIN(ReflectSetPrototypeOf) {
   }
 
   Maybe<bool> result = JSReceiver::SetPrototype(
-      Handle<JSReceiver>::cast(target), proto, true, DONT_THROW);
+      Handle<JSReceiver>::cast(target), proto, true, Object::DONT_THROW);
   MAYBE_RETURN(result, isolate->heap()->exception());
   return *isolate->factory()->ToBoolean(result.FromJust());
 }