Revert of [proxies] Implement [[Enumerate]] and [[OwnPropertyKeys]]

src/key-accumulator.cc

Index: src/key-accumulator.cc
diff --git a/src/key-accumulator.cc b/src/key-accumulator.cc
index 68fe9d8cb70df5d0ab0ae2f7864d272266ec8d77..91b014aacd7b688f521ebb7e131d4d0dcd76a2cb 100644
--- a/src/key-accumulator.cc
+++ b/src/key-accumulator.cc
@@ -217,18 +217,6 @@
 }
 
 
-void KeyAccumulator::AddKeysFromProxy(Handle<FixedArray> keys) {
-  // Proxies define a complete list of keys with no distinction of
-  // elements and properties, which breaks the normal assumption for the
-  // KeyAccumulator.
-  AddKeys(keys, PROXY_MAGIC);
-  // Invert the current length to indicate a present proxy, so we can ignore
-  // element keys for this level. Otherwise we would not fully respect the order
-  // given by the proxy.
-  level_string_length_ = -level_string_length_;
-}
-
-
 void KeyAccumulator::AddElementKeysFromInterceptor(
     Handle<JSObject> array_like) {
   AddKeys(array_like, CONVERT_TO_ARRAY_INDEX);