Remove code handling parameters rewritten to properties (aka synthetic properties).

src/ast.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1213 matching lines @@
 
  private:
   Variable* var_;
   Type type_;
   int index_;
 };
 
 
 class Property: public Expression {
  public:
-  // Synthetic properties are property lookups introduced by the system,
-  // to objects that aren't visible to the user. Function calls to synthetic
-  // properties should use the global object as receiver, not the base object
-  // of the resolved Reference.
-  enum Type { NORMAL, SYNTHETIC };
   Property(Isolate* isolate,
            Expression* obj,
            Expression* key,
-           int pos,
-           Type type = NORMAL)
+           int pos)
       : Expression(isolate),
         obj_(obj),
         key_(key),
         pos_(pos),
-        type_(type),
         is_monomorphic_(false),
         is_array_length_(false),
         is_string_length_(false),
         is_string_access_(false),
         is_function_prototype_(false) { }
 
   DECLARE_NODE_TYPE(Property)
 
   virtual bool IsValidLeftHandSide() { return true; }
   virtual bool IsInlineable() const;
 
   Expression* obj() const { return obj_; }
   Expression* key() const { return key_; }
   virtual int position() const { return pos_; }
-  bool is_synthetic() const { return type_ == SYNTHETIC; }
 
   bool IsStringLength() const { return is_string_length_; }
   bool IsStringAccess() const { return is_string_access_; }
   bool IsFunctionPrototype() const { return is_function_prototype_; }
 
   // Type feedback information.
   void RecordTypeFeedback(TypeFeedbackOracle* oracle);
   virtual bool IsMonomorphic() { return is_monomorphic_; }
   virtual SmallMapList* GetReceiverTypes() { return &receiver_types_; }
   virtual bool IsArrayLength() { return is_array_length_; }
 
  private:
   Expression* obj_;
   Expression* key_;
   int pos_;
-  Type type_;
 
   SmallMapList receiver_types_;
   bool is_monomorphic_ : 1;
   bool is_array_length_ : 1;
   bool is_string_length_ : 1;
   bool is_string_access_ : 1;
   bool is_function_prototype_ : 1;
 };
 
 
@@ skipping 972 matching lines @@
 
  private:
   Isolate* isolate_;
   bool stack_overflow_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_