Fix name shown by devtools for subclasses.

src/messages.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/messages.h"
 
 #include "src/api.h"
 #include "src/execution.h"
 #include "src/isolate-inl.h"
 #include "src/string-builder.h"
@@ skipping 399 matching lines @@
   // created error object, use that name property. Otherwise just use the
   // constructor name to avoid triggering possible side effects.
   // Similar for the message property. If the message property shadows the
   // internally created error object, use that message property. Otherwise
   // use empty string as message.
   LookupIterator name_lookup(error, name_string,
                              LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
   if (internal_error_lookup.IsFound() &&
       !ShadowsInternalError(isolate, &name_lookup, &internal_error_lookup)) {
     Handle<JSObject> holder = internal_error_lookup.GetHolder<JSObject>();
-    name = Handle<String>(holder->constructor_name());
+    name = JSReceiver::GetConstructorName(holder);
   } else {
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate, name,
         GetStringifiedProperty(isolate, &name_lookup,
                                isolate->factory()->Error_string()),
         String);
   }
 
   LookupIterator message_lookup(
       error, message_string, LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
@@ skipping 44 matching lines @@
   if (obj->IsUndefined()) return default_value;
   if (!obj->IsString()) {
     ASSIGN_RETURN_ON_EXCEPTION(isolate, obj, Object::ToString(isolate, obj),
                                String);
   }
   return Handle<String>::cast(obj);
 }
 
 }  // namespace internal
 }  // namespace v8