[Loader] Make ThreadableLoader non-RefCounted and be managed by OwnPtr

third_party/WebKit/Source/core/fileapi/FileReaderLoader.h

 /*
  * 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 104 matching lines @@
 
     static FileError::ErrorCode httpStatusCodeToErrorCode(int);
 
     ReadType m_readType;
     FileReaderLoaderClient* m_client;
     WTF::TextEncoding m_encoding;
     String m_dataType;
 
     KURL m_urlForReading;
     bool m_urlForReadingIsStream;
-    RefPtr<ThreadableLoader> m_loader;
+    OwnPtr<ThreadableLoader> m_loader;
 
     OwnPtr<ArrayBufferBuilder> m_rawData;
     bool m_isRawDataConverted;
 
     String m_stringResult;
 
     // The decoder used to decode the text data.
     OwnPtr<TextResourceDecoder> m_decoder;
 
     bool m_finishedLoading;
     long long m_bytesLoaded;
     // If the total size of the resource is unknown, m_totalBytes is set to -1
     // until completion of loading, and the buffer for receiving data is set to
     // dynamically grow. Otherwise, m_totalBytes is set to the total size and
     // the buffer for receiving data of m_totalBytes is allocated and never grow
     // even when extra data is appeneded.
     long long m_totalBytes;
 
     bool m_hasRange;
     unsigned m_rangeStart;
     unsigned m_rangeEnd;
 
     FileError::ErrorCode m_errorCode;
 };
 
 } // namespace blink
 
 #endif // FileReaderLoader_h