Improve creating external array buffer in d8.

src/d8.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 470 matching lines @@
       if (try_catch.HasCaught()) return try_catch.Exception();
       init_from_array = true;
     } else {
       // Construct from size.
       length = convertToUint(args[0], &try_catch);
       if (try_catch.HasCaught()) return try_catch.Exception();
     }
     byteLength = length * element_size;
     byteOffset = 0;
 
-    Handle<Object> global = Context::GetCurrent()->Global();
-    Handle<Value> array_buffer = global->Get(String::New("ArrayBuffer"));
-    ASSERT(!try_catch.HasCaught() && array_buffer->IsFunction());
-    Handle<Value> buffer_args[] = { Uint32::New(byteLength) };
-    Handle<Value> result = Handle<Function>::Cast(array_buffer)->NewInstance(
-        1, buffer_args);
-    if (try_catch.HasCaught()) return result;
-    buffer = result->ToObject();
+    buffer = CreateExternalArrayBuffer(Object::New(), byteLength)->ToObject();
   }
 
   Handle<Object> array = CreateExternalArray(
       args.This(), buffer, type, length, byteLength, byteOffset, element_size);
 
   if (init_from_array) {
     Handle<Object> init = args[0]->ToObject();
     for (int i = 0; i < length; ++i) array->Set(i, init->Get(i));
   }
 
@@ skipping 1168 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif