Revert "Trigger exception debug event for promises at the throw site."

src/isolate.cc

 // Copyright 2012 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 <stdlib.h>
 
 #include "v8.h"
 
 #include "ast.h"
 #include "bootstrapper.h"
@@ skipping 1013 matching lines @@
   bool report_exception = catchable_by_javascript && should_report_exception;
   bool try_catch_needs_message =
       can_be_caught_externally && try_catch_handler()->capture_message_ &&
       !thread_local_top()->rethrowing_message_;
   bool bootstrapping = bootstrapper()->IsActive();
 
   thread_local_top()->rethrowing_message_ = false;
 
   // Notify debugger of exception.
   if (catchable_by_javascript) {
-    debugger_->OnException(exception_handle, report_exception);
+    debugger_->OnException(
+        exception_handle, report_exception, factory()->undefined_value());
   }
 
   // Generate the message if required.
   if (report_exception || try_catch_needs_message) {
     MessageLocation potential_computed_location;
     if (location == NULL) {
       // If no location was specified we use a computed one instead.
       ComputeLocation(&potential_computed_location);
       location = &potential_computed_location;
     }
@@ skipping 1201 matching lines @@
   handle_scope_implementer()->IncrementCallDepth();
   if (run_microtasks) Execution::RunMicrotasks(this);
   for (int i = 0; i < call_completed_callbacks_.length(); i++) {
     call_completed_callbacks_.at(i)();
   }
   handle_scope_implementer()->DecrementCallDepth();
 }
 
 
 } }  // namespace v8::internal