Various extension-related cleanup and simplifications.

src/extensions/statistics-extension.cc

 // Copyright 2012 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 152 matching lines @@
   AddNumber(args.GetIsolate(), result, heap->lo_space()->Available(),
             "lo_space_available_bytes");
   AddNumber(args.GetIsolate(), result, heap->lo_space()->CommittedMemory(),
             "lo_space_commited_bytes");
   AddNumber64(args.GetIsolate(), result,
               heap->amount_of_external_allocated_memory(),
               "amount_of_external_allocated_memory");
   args.GetReturnValue().Set(result);
 }
 
-
-void StatisticsExtension::Register() {
-  static StatisticsExtension statistics_extension;
-  static v8::DeclareExtension declaration(&statistics_extension);
-}
-
 } }  // namespace v8::internal