[keys] Simplify KeyAccumulator

src/debug/debug-scopes.cc

 // Copyright 2015 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/debug/debug-scopes.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
@@ skipping 750 matching lines @@
         .Check();
   }
 }
 
 void ScopeIterator::CopyContextExtensionToScopeObject(
     Handle<Context> context, Handle<JSObject> scope_object,
     KeyCollectionType type) {
   if (context->extension_object() == nullptr) return;
   Handle<JSObject> extension(context->extension_object());
   Handle<FixedArray> keys =
-      JSReceiver::GetKeys(extension, type, ENUMERABLE_STRINGS)
+      KeyAccumulator::GetKeys(extension, type, ENUMERABLE_STRINGS)
           .ToHandleChecked();
 
   for (int i = 0; i < keys->length(); i++) {
     // Names of variables introduced by eval are strings.
     DCHECK(keys->get(i)->IsString());
     Handle<String> key(String::cast(keys->get(i)));
     Handle<Object> value =
         Object::GetPropertyOrElement(extension, key).ToHandleChecked();
     JSObject::SetOwnPropertyIgnoreAttributes(scope_object, key, value, NONE)
         .Check();
@@ skipping 18 matching lines @@
     DCHECK((beg_pos >= 0 && end_pos >= 0) || inner_scope->is_hidden());
     if (beg_pos <= position && position < end_pos) {
       GetNestedScopeChain(isolate, inner_scope, position);
       return;
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8