Remove unused threading includes from FileReader.

Source/core/fileapi/FileReader.cpp

 /*
  * Copyright (C) 2010 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 29 matching lines @@
 #include "core/fileapi/File.h"
 #include "core/frame/LocalFrame.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "platform/Logging.h"
 #include "platform/Supplementable.h"
 #include "wtf/ArrayBuffer.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/Deque.h"
 #include "wtf/HashSet.h"
-#include "wtf/ThreadSpecific.h"
-#include "wtf/Threading.h"
 #include "wtf/text/CString.h"
 
 namespace blink {
 
 namespace {
 
 #if !LOG_DISABLED
 const CString utf8BlobUUID(Blob* blob)
 {
     return blob->uuid().utf8();
@@ skipping 425 matching lines @@
     return m_loader->stringResult();
 }
 
 void FileReader::trace(Visitor* visitor)
 {
     visitor->trace(m_error);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink