Move createClosure from V8PromiseCustom.cpp to V8Binding.h

Source/bindings/v8/custom/V8PromiseCustom.cpp

 /*
  * Copyright (C) 2013 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 33 matching lines @@
 #include "core/page/DOMWindow.h"
 #include "core/platform/Task.h"
 #include "wtf/Functional.h"
 #include "wtf/PassOwnPtr.h"
 #include <v8.h>
 
 namespace WebCore {
 
 namespace {
 
-v8::Local<v8::Function> createClosure(v8::FunctionCallback function, v8::Handle<v8::Value> environment)
-{
-    return v8::FunctionTemplate::New(function, environment)->GetFunction();
-}
-
 class PromiseTask : public ScriptExecutionContext::Task {
 public:
     PromiseTask(v8::Handle<v8::Function> callback, v8::Handle<v8::Object> receiver, v8::Handle<v8::Value> result)
         : m_callback(callback)
         , m_receiver(receiver)
         , m_result(result)
     {
         ASSERT(!m_callback.isEmpty());
         ASSERT(!m_receiver.isEmpty());
         ASSERT(!m_result.isEmpty());
@@ skipping 534 matching lines @@
         v8::TryCatch trycatch;
         v8::Handle<v8::Value> args[] = { result };
         V8ScriptRunner::callFunction(function, getScriptExecutionContext(), receiver, WTF_ARRAY_LENGTH(args), args);
     } else {
         ASSERT(mode == Asynchronous);
         postTask(function, receiver, result, isolate);
     }
 }
 
 } // namespace WebCore