[promises] Clean up promise utils and remove dead code

src/runtime/runtime-promise.cc

 // Copyright 2016 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/runtime/runtime-utils.h"
 
 #include "src/debug/debug.h"
 #include "src/elements.h"
-#include "src/promise-utils.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
 
 void PromiseRejectEvent(Isolate* isolate, Handle<JSPromise> promise,
                         Handle<Object> rejected_promise, Handle<Object> value,
                         bool debug_event) {
   isolate->RunPromiseHook(PromiseHookType::kResolve, promise,
@@ skipping 220 matching lines @@
   HandleScope scope(isolate);
   DCHECK_EQ(1, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
   isolate->RunPromiseHook(PromiseHookType::kAfter, promise,
                           isolate->factory()->undefined_value());
   return isolate->heap()->undefined_value();
 }
 
 }  // namespace internal
 }  // namespace v8