[cleanup] Remove unused stack_trace_ member from PromiseRejectMessage

R=yangguo@chromium.org

Bug: v8:8742
Change-Id: I307097021893617ed5178f1e967f9360a55cd929
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1520710
Auto-Submit: Simon Zünd <szuend@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60221}

include/v8.h

@@ -6717,11 +6717,8 @@ enum PromiseRejectEvent {
 class PromiseRejectMessage {
  public:
   PromiseRejectMessage(Local<Promise> promise, PromiseRejectEvent event,
-                       Local<Value> value, Local<StackTrace> stack_trace)
-      : promise_(promise),
-        event_(event),
-        value_(value),
-        stack_trace_(stack_trace) {}
+                       Local<Value> value)
+      : promise_(promise), event_(event), value_(value) {}
 
   V8_INLINE Local<Promise> GetPromise() const { return promise_; }
   V8_INLINE PromiseRejectEvent GetEvent() const { return event_; }
@@ -6731,7 +6728,6 @@ class PromiseRejectMessage {
   Local<Promise> promise_;
   PromiseRejectEvent event_;
   Local<Value> value_;
-  Local<StackTrace> stack_trace_;
 };
 
 typedef void (*PromiseRejectCallback)(PromiseRejectMessage message);

src/isolate.cc

@@ -4418,13 +4418,8 @@ void Isolate::ReportPromiseReject(Handle<JSPromise> promise,
                                   Handle<Object> value,
                                   v8::PromiseRejectEvent event) {
   if (promise_reject_callback_ == nullptr) return;
-  Handle<FixedArray> stack_trace;
-  if (event != v8::kPromiseHandlerAddedAfterReject && value->IsJSObject()) {
-    stack_trace = GetDetailedStackTrace(Handle<JSObject>::cast(value));
-  }
   promise_reject_callback_(v8::PromiseRejectMessage(
-      v8::Utils::PromiseToLocal(promise), event, v8::Utils::ToLocal(value),
-      v8::Utils::StackTraceToLocal(stack_trace)));
+      v8::Utils::PromiseToLocal(promise), event, v8::Utils::ToLocal(value)));
 }
 
 void Isolate::SetUseCounterCallback(v8::Isolate::UseCounterCallback callback) {