[proxies] allow duplicate keys for [[OwnPropertyKeys]] trap.

src/debug/debug-scopes.cc

Index: src/debug/debug-scopes.cc
diff --git a/src/debug/debug-scopes.cc b/src/debug/debug-scopes.cc
index d71cccef683e68db8dcb6012a811ded1e604c4c5..02d1cf319403b24e201fa6fb8faf4fbe21d4bbef 100644
--- a/src/debug/debug-scopes.cc
+++ b/src/debug/debug-scopes.cc
@@ -476,8 +476,8 @@ MaybeHandle<JSObject> ScopeIterator::MaterializeLocalScope() {
       function_context->has_extension() &&
       !function_context->IsNativeContext()) {
     bool success = CopyContextExtensionToScopeObject(
-        handle(function_context->extension_object(), isolate_),
-        local_scope, JSReceiver::INCLUDE_PROTOS);
+        handle(function_context->extension_object(), isolate_), local_scope,
+        INCLUDE_PROTOS);
     if (!success) return MaybeHandle<JSObject>();
   }
 
@@ -506,8 +506,7 @@ Handle<JSObject> ScopeIterator::MaterializeClosure() {
   // be variables introduced by eval.
   if (context->has_extension()) {
     bool success = CopyContextExtensionToScopeObject(
-        handle(context->extension_object(), isolate_), closure_scope,
-        JSReceiver::OWN_ONLY);
+        handle(context->extension_object(), isolate_), closure_scope, OWN_ONLY);
     DCHECK(success);
     USE(success);
   }
@@ -555,8 +554,7 @@ Handle<JSObject> ScopeIterator::MaterializeBlockScope() {
     // Fill all extension variables.
     if (context->extension_object() != nullptr) {
       bool success = CopyContextExtensionToScopeObject(
-          handle(context->extension_object()), block_scope,
-          JSReceiver::OWN_ONLY);
+          handle(context->extension_object()), block_scope, OWN_ONLY);
       DCHECK(success);
       USE(success);
     }
@@ -794,10 +792,9 @@ void ScopeIterator::CopyContextLocalsToScopeObject(
   }
 }
 
-
 bool ScopeIterator::CopyContextExtensionToScopeObject(
     Handle<JSObject> extension, Handle<JSObject> scope_object,
-    JSReceiver::KeyCollectionType type) {
+    KeyCollectionType type) {
   Handle<FixedArray> keys;
   ASSIGN_RETURN_ON_EXCEPTION_VALUE(
       isolate_, keys, JSReceiver::GetKeys(extension, type, ENUMERABLE_STRINGS),