Rolling back r9662.

src/extensions/externalize-string-extension.cc

 // Copyright 2010 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 109 matching lines @@
   return v8::Undefined();
 }
 
 
 v8::Handle<v8::Value> ExternalizeStringExtension::IsAscii(
     const v8::Arguments& args) {
   if (args.Length() != 1 || !args[0]->IsString()) {
     return v8::ThrowException(v8::String::New(
         "isAsciiString() requires a single string argument."));
   }
-  Handle<String> string = Utils::OpenHandle(*args[0].As<v8::String>());
-  return string->IsAsciiRepresentationUnderneath() ? v8::True() : v8::False();
+  return Utils::OpenHandle(*args[0].As<v8::String>())->IsAsciiRepresentation() ?
+      v8::True() : v8::False();
 }
 
 
 void ExternalizeStringExtension::Register() {
   static ExternalizeStringExtension* externalize_extension = NULL;
   if (externalize_extension == NULL)
     externalize_extension = new ExternalizeStringExtension;
   static v8::DeclareExtension externalize_extension_declaration(
       externalize_extension);
 }
 
 } }  // namespace v8::internal