Use C++11 features in core/workers.

Source/core/workers/WorkerScriptLoader.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 24 matching lines @@
 #include "core/workers/WorkerScriptLoaderClient.h"
 #include "platform/network/ResourceResponse.h"
 #include "public/platform/WebURLRequest.h"
 
 #include "wtf/OwnPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 WorkerScriptLoader::WorkerScriptLoader()
-    : m_client(0)
+    : m_client(nullptr)
     , m_failed(false)
     , m_identifier(0)
     , m_finishing(false)
     , m_requestContext(blink::WebURLRequest::RequestContextWorker)
 {
 }
 
 WorkerScriptLoader::~WorkerScriptLoader()
 {
 }
@@ skipping 128 matching lines @@
 void WorkerScriptLoader::notifyFinished()
 {
     if (!m_client || m_finishing)
         return;
 
     m_finishing = true;
     m_client->notifyFinished();
 }
 
 } // namespace blink