Revert "Ship promises and weak collections"

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5814 matching lines @@
   ENTER_V8(isolate);
   i::Handle<i::JSObject> result = i::JSObject::Copy(paragon_handle);
   has_pending_exception = result.is_null();
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
   return Utils::ToLocal(result);
 }
 
 
 bool Value::IsPromise() const {
   i::Handle<i::Object> val = Utils::OpenHandle(this);
-  if (!val->IsJSObject()) return false;
+  if (!i::FLAG_harmony_promises || !val->IsJSObject()) return false;
   i::Handle<i::JSObject> obj = i::Handle<i::JSObject>::cast(val);
   i::Isolate* isolate = obj->GetIsolate();
   LOG_API(isolate, "IsPromise");
   ENTER_V8(isolate);
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> argv[] = { obj };
   i::Handle<i::Object> b = i::Execution::Call(
       isolate,
       handle(
           isolate->context()->global_object()->native_context()->is_promise()),
@@ skipping 1789 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal