Push version 2.5.7 to trunk....

src/extensions/externalize-string-extension.h

 // 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 30 matching lines @@
   static v8::Handle<v8::Value> Externalize(const v8::Arguments& args);
   static v8::Handle<v8::Value> IsAscii(const v8::Arguments& args);
   static void Register();
  private:
   static const char* const kSource;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_EXTENSIONS_EXTERNALIZE_STRING_EXTENSION_H_