Clean up d8 ArrayBuffer implementation and fix bug in readbuffer:

src/d8.h

 // 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 365 matching lines @@
   static i::OS::MemoryMappedFile* counters_file_;
   static i::Mutex* context_mutex_;
 
   static Counter* GetCounter(const char* name, bool is_histogram);
   static void InstallUtilityScript();
 #endif  // V8_SHARED
   static void Initialize();
   static void RunShell();
   static bool SetOptions(int argc, char* argv[]);
   static Handle<ObjectTemplate> CreateGlobalTemplate();
+  static Handle<Value> CreateExternalArrayBuffer(int32_t size);
+  static Handle<Value> CreateExternalArrayBuffer(const Arguments& args);
   static Handle<Value> CreateExternalArray(const Arguments& args,
                                            ExternalArrayType type,
-                                           size_t element_size);
+                                           int32_t element_size);
   static void ExternalArrayWeakCallback(Persistent<Value> object, void* data);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_