[Arguments] Remove synthetic properties and all code dealing with them.

arguments/src/scopes.h

Index: arguments/src/scopes.h
diff --git a/arguments/src/scopes.h b/arguments/src/scopes.h
index c8fb318943a3519ae54437900301954d4e729791..d5f496fa308653b08f7024d319de38a80f1c0184 100644
--- a/arguments/src/scopes.h
+++ b/arguments/src/scopes.h
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// 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:
@@ -251,7 +251,6 @@ class Scope: public ZoneObject {
   int num_parameters() const { return params_.length(); }
 
   // The local variable 'arguments' if we need to allocate it; NULL otherwise.
-  // If arguments() exist, arguments_shadow() exists, too.
   Variable* arguments() const { return arguments_; }
 
   // Declarations list.