[oilpan]: optimize the way we allocate persistent handles in wrappers.

Source/bindings/core/v8/custom/V8ArrayBufferCustom.cpp

 /*
  * Copyright (C) 2009 Google Inc. 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
@@ skipping 49 matching lines @@
 void V8ArrayBuffer::refObject(ScriptWrappableBase* internalPointer)
 {
     fromInternalPointer(internalPointer)->ref();
 }
 
 void V8ArrayBuffer::derefObject(ScriptWrappableBase* internalPointer)
 {
     fromInternalPointer(internalPointer)->deref();
 }
 
-PersistentNode* V8ArrayBuffer::createPersistentHandle(ScriptWrappableBase* internalPointer)
+WrapperPersistentNode* V8ArrayBuffer::createPersistentHandle(ScriptWrappableBase* internalPointer)
 {
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 v8::Handle<v8::Object> V8ArrayBuffer::createWrapper(PassRefPtr<ArrayBuffer> impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     ASSERT(impl.get());
     ASSERT(!DOMDataStore::containsWrapper<V8ArrayBuffer>(impl.get(), isolate));
 
@@ skipping 27 matching lines @@
     return V8ArrayBuffer::hasInstance(value, isolate) ? V8ArrayBuffer::toNative(v8::Handle<v8::Object>::Cast(value)) : 0;
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(ArrayBuffer* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace blink