Remove comments from the PNG callbacks

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 45 matching lines @@
 #define JMPBUF(png_ptr) png_ptr->jmpbuf
 #endif
 
 namespace {
 
 inline blink::PNGImageDecoder* imageDecoder(png_structp png)
 {
     return static_cast<blink::PNGImageDecoder*>(png_get_progressive_ptr(png));
 }
 
-// Called when image header information is available (including the size).
 void PNGAPI pngHeaderAvailable(png_structp png, png_infop)
 {
     imageDecoder(png)->headerAvailable();
 }
 
-// Called when a decoded row is ready.
-void PNGAPI pngRowAvailable(png_structp png, png_bytep rowBuffer, png_uint_32 rowIndex, int interlacePass)
+void PNGAPI pngRowAvailable(png_structp png, png_bytep row, png_uint_32 rowIndex, int state)
 {
-    imageDecoder(png)->rowAvailable(rowBuffer, rowIndex, interlacePass);
+    imageDecoder(png)->rowAvailable(row, rowIndex, state);
 }
 
-// Called when decoding completes.
 void PNGAPI pngComplete(png_structp png, png_infop)
 {
     imageDecoder(png)->complete();
 }
 
-// Called when decoding fails.
 void PNGAPI pngFailed(png_structp png, png_const_charp)
 {
     longjmp(JMPBUF(png), 1);
 }
 
 } // anonymous
 
 namespace blink {
 
 class PNGImageReader {
@@ skipping 442 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() || failed())
         m_reader.clear();
 }
 
 } // namespace blink