[inspector] async stacks for Promise.then calls...

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 8979a7b479312fe0797c5bfefcc1015029f44750..cabf6cbe336fae8a71dd653d7c8a47abccc97f4b 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -3200,17 +3200,15 @@ class PromiseDebugEventScope {
         is_debug_active_(isolate_->debug()->is_active() && id_->IsNumber() &&
                          name_->IsString()) {
     if (is_debug_active_) {
-      isolate_->debug()->OnAsyncTaskEvent(
-          isolate_->factory()->will_handle_string(), id_,
-          Handle<String>::cast(name_));
+      isolate_->debug()->OnAsyncTaskEvent(debug::WillHandle, id_,
+                                          Handle<String>::cast(name_));
     }
   }
 
   ~PromiseDebugEventScope() {
     if (is_debug_active_) {
-      isolate_->debug()->OnAsyncTaskEvent(
-          isolate_->factory()->did_handle_string(), id_,
-          Handle<String>::cast(name_));
+      isolate_->debug()->OnAsyncTaskEvent(debug::DidHandle, id_,
+                                          Handle<String>::cast(name_));
     }
   }