Make platform/image-decoders to use USING_FAST_MALLOC.

third_party/WebKit/Source/platform/image-decoders/png/PNGImageDecoder.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * Portions are Copyright (C) 2001 mozilla.org
  *
  * Other contributors:
  *   Stuart Parmenter <stuart@mozilla.com>
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 66 matching lines @@
 
 void PNGAPI pngFailed(png_structp png, png_const_charp)
 {
     longjmp(JMPBUF(png), 1);
 }
 
 } // anonymous
 
 namespace blink {
 
-class PNGImageReader {
+class PNGImageReader final {
     USING_FAST_MALLOC(PNGImageReader);
+    WTF_MAKE_NONCOPYABLE(PNGImageReader);
 public:
     PNGImageReader(PNGImageDecoder* decoder, unsigned readOffset)
         : m_decoder(decoder)
         , m_readOffset(readOffset)
         , m_currentBufferSize(0)
         , m_decodingSizeOnly(false)
         , m_hasAlpha(false)
 #if USE(QCMSLIB)
         , m_transform(0)
         , m_rowBuffer()
@@ skipping 396 matching lines @@
     // has failed.
     if (!m_reader->decode(*m_data, onlySize) && isAllDataReceived())
         setFailed();
 
     // If decoding is done or failed, we don't need the PNGImageReader anymore.
     if (isComplete(this) || failed())
         m_reader.clear();
 }
 
 } // namespace blink