Valgrind cleanliness, part 5: Delete extensions on exit.

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 115 matching lines @@
   if (args.Length() != 1 || !args[0]->IsString()) {
     return v8::ThrowException(v8::String::New(
         "isAsciiString() requires a single string argument."));
   }
   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);
+  static ExternalizeStringExtension externalize_extension;
+  static v8::DeclareExtension declaration(&externalize_extension);
 }
 
 } }  // namespace v8::internal