[proxies] Improve error messages.

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index 87ee30a85712ccce989bcd5ba8eacf9b95c0d645..73421d9273c241813b901b0353e7381c103525cf 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -183,14 +183,9 @@ RUNTIME_FUNCTION(Runtime_SetPrototype) {
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, obj, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
-  Maybe<bool> status =
-      JSReceiver::SetPrototype(obj, prototype, true, Object::THROW_ON_ERROR);
-  if (status.IsNothing()) return isolate->heap()->exception();
-  if (!status.FromJust()) {
-    THROW_NEW_ERROR_RETURN_FAILURE(
-        isolate,
-        NewTypeError(MessageTemplate::kProxySetPrototypeFailed, prototype));
-  }
+  MAYBE_RETURN(
+      JSReceiver::SetPrototype(obj, prototype, true, Object::THROW_ON_ERROR),
+      isolate->heap()->exception());
   return *obj;
 }