Turn on -Werror on all non-Win platforms.

Source/core/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 244 matching lines @@
 }
 
 bool PNGImageDecoder::setFailed()
 {
     if (m_doNothingOnFailure)
         return false;
     m_reader.clear();
     return ImageDecoder::setFailed();
 }
 
+#if USE(QCMSLIB)
 static void readColorProfile(png_structp png, png_infop info, ColorProfile& colorProfile)
 {
 #ifdef PNG_iCCP_SUPPORTED
     char* profileName;
     int compressionType;
 #if (PNG_LIBPNG_VER < 10500)
     png_charp profile;
 #else
     png_bytep profile;
 #endif
@@ skipping 13 matching lines @@
 
     ASSERT(colorProfile.isEmpty());
     if (!ignoreProfile)
         colorProfile.append(profileData, profileLength);
 #else
     UNUSED_PARAM(png);
     UNUSED_PARAM(info);
     UNUSED_PARAM(colorProfile);
 #endif
 }
+#endif
 
 void PNGImageDecoder::headerAvailable()
 {
     png_structp png = m_reader->pngPtr();
     png_infop info = m_reader->infoPtr();
     png_uint_32 width = png_get_image_width(png, info);
     png_uint_32 height = png_get_image_height(png, info);
 
     // Protect against large images.
     if (width > cMaxPNGSize || height > cMaxPNGSize) {
@@ skipping 214 matching lines @@
     // has failed.
     if (!m_reader->decode(*m_data, onlySize) && isAllDataReceived())
         setFailed();
     // If we're done decoding the image, we don't need the PNGImageReader
     // anymore.  (If we failed, |m_reader| has already been cleared.)
     else if (isComplete())
         m_reader.clear();
 }
 
 } // namespace WebCore