[inspector] introduced stepIntoAsync for chained callbacks

src/debug/debug.cc

Index: src/debug/debug.cc
diff --git a/src/debug/debug.cc b/src/debug/debug.cc
index bed6b12e864cabf740bf9447d45c0a309765cc83..cb82a12a515a89c940471986cf8e6e224e52ddc4 100644
--- a/src/debug/debug.cc
+++ b/src/debug/debug.cc
@@ -1927,9 +1927,6 @@ void ResetPromiseHandle(const v8::WeakCallbackInfo<void>& info) {
 // different stacks from direct Promise use, but we save and restore a
 // stack once for all reactions.
 //
-// If this isn't a case of async function, we return false, otherwise
-// we set the correct id and return true.
-//
 // TODO(littledan): Improve this case.
 int GetReferenceAsyncTaskId(Isolate* isolate, Handle<JSPromise> promise) {
   Handle<Symbol> handled_by_symbol =