Clean up native context slots and add new ones.

src/debug/debug.cc

 // Copyright 2012 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/debug/debug.h"
 
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 1805 matching lines @@
   // Check whether the promise has been marked as having triggered a message.
   Handle<Symbol> key = isolate_->factory()->promise_debug_marker_symbol();
   if (JSReceiver::GetDataProperty(promise, key)->IsUndefined()) {
     OnException(value, promise);
   }
 }
 
 
 MaybeHandle<Object> Debug::PromiseHasUserDefinedRejectHandler(
     Handle<JSObject> promise) {
-  Handle<JSFunction> fun = Handle<JSFunction>::cast(
-      JSReceiver::GetDataProperty(isolate_->js_builtins_object(),
-                                  isolate_->factory()->NewStringFromStaticChars(
-                                      "$promiseHasUserDefinedRejectHandler")));
+  Handle<JSFunction> fun = isolate_->promise_has_user_defined_reject_handler();
   return Execution::Call(isolate_, fun, promise, 0, NULL);
 }
 
 
 void Debug::OnException(Handle<Object> exception, Handle<Object> promise) {
   // In our prediction, try-finally is not considered to catch.
   Isolate::CatchType catch_type = isolate_->PredictExceptionCatcher();
   bool uncaught = (catch_type == Isolate::NOT_CAUGHT);
   if (promise->IsJSObject()) {
     Handle<JSObject> jspromise = Handle<JSObject>::cast(promise);
@@ skipping 839 matching lines @@
 }
 
 
 void LockingCommandMessageQueue::Clear() {
   base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }
 
 }  // namespace internal
 }  // namespace v8