[promises] Remove PromiseRejectEvent

This is no longer used.

BUG=v8:5343

Review-Url: https://codereview.chromium.org/2454713003
Cr-Commit-Position: refs/heads/master@{#40622}

src/runtime/runtime-promise.cc

@@ -28,17 +28,6 @@ void PromiseRejectEvent(Isolate* isolate, Handle<JSReceiver> promise,
 
 }  // namespace
 
-RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
-  DCHECK(args.length() == 3);
-  HandleScope scope(isolate);
-  CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
-  CONVERT_BOOLEAN_ARG_CHECKED(debug_event, 2);
-
-  PromiseRejectEvent(isolate, promise, promise, value, debug_event);
-  return isolate->heap()->undefined_value();
-}
-
 RUNTIME_FUNCTION(Runtime_PromiseRejectEventFromStack) {
   DCHECK(args.length() == 2);
   HandleScope scope(isolate);

src/runtime/runtime.h

@@ -306,7 +306,6 @@ namespace internal {
   F(OrdinaryHasInstance, 2, 1)                      \
   F(PromiseReject, 3, 1)                            \
   F(PromiseFulfill, 4, 1)                           \
-  F(PromiseRejectEvent, 3, 1)                       \
   F(PromiseRejectEventFromStack, 2, 1)              \
   F(PromiseRevokeReject, 1, 1)                      \
   F(PromoteScheduledException, 0, 1)                \