[cleanup] Remove cruft from old rest parameter implementation

src/ast/ast-value-factory.h

Index: src/ast/ast-value-factory.h
diff --git a/src/ast/ast-value-factory.h b/src/ast/ast-value-factory.h
index 1c2144c480d462fc9bcb5c1effd5790b1c164f67..d6c409374c304cbae8c4da2996e83dff9a63b0fc 100644
--- a/src/ast/ast-value-factory.h
+++ b/src/ast/ast-value-factory.h
@@ -264,7 +264,6 @@ class AstValue : public ZoneObject {
   F(next, "next")                               \
   F(proto, "__proto__")                         \
   F(prototype, "prototype")                     \
-  F(rest_parameter, ".rest_parameter")          \
   F(this, "this")                               \
   F(this_function, ".this_function")            \
   F(undefined, "undefined")                     \