[cleanup] Remove cruft from old rest parameter implementation

src/ast/scopes.h

Index: src/ast/scopes.h
diff --git a/src/ast/scopes.h b/src/ast/scopes.h
index 3ef40ecf91d4e646be78d63065beda1f73578d6d..9effd1d02981bc51050544880786d8b31dbba464 100644
--- a/src/ast/scopes.h
+++ b/src/ast/scopes.h
@@ -420,17 +420,6 @@ class Scope: public ZoneObject {
 
   int num_parameters() const { return params_.length(); }
 
-  // A function can have at most one rest parameter. Returns Variable* or NULL.
-  Variable* rest_parameter(int* index) const {
-    *index = rest_index_;
-    if (rest_index_ < 0) return NULL;
-    return rest_parameter_;
-  }
-
-  bool has_rest_parameter() const {
-    return rest_index_ >= 0;
-  }
-
   bool has_simple_parameters() const {
     return has_simple_parameters_;
   }
@@ -702,7 +691,6 @@ class Scope: public ZoneObject {
   int arity_;
   bool has_simple_parameters_;
   Variable* rest_parameter_;
-  int rest_index_;
 
   // Serialized scope info support.
   Handle<ScopeInfo> scope_info_;