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

src/debug/debug-scopes.h

Index: src/debug/debug-scopes.h
diff --git a/src/debug/debug-scopes.h b/src/debug/debug-scopes.h
index d4e335a2a542a46f734b20f17b14cf63cb69992a..a7e2a45cc8c1fcedb8d6c55491582320673c115d 100644
--- a/src/debug/debug-scopes.h
+++ b/src/debug/debug-scopes.h
@@ -139,7 +139,7 @@ class ScopeIterator {
                                       Handle<JSObject> scope_object);
   bool CopyContextExtensionToScopeObject(Handle<JSObject> extension,
                                          Handle<JSObject> scope_object,
-                                         JSReceiver::KeyCollectionType type);
+                                         KeyCollectionType type);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ScopeIterator);
 };