Removing a bunch of unused platform code.

Source/WebCore/platform/image-decoders/jpeg/JPEGImageDecoder.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * Portions are Copyright (C) 2001-6 mozilla.org
  *
  * Other contributors:
  *   Stuart Parmenter <stuart@mozilla.com>
  *
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  *
@@ skipping 90 matching lines @@
     JPEG_DECOMPRESS_PROGRESSIVE, // Output progressive pixels
     JPEG_DECOMPRESS_SEQUENTIAL,  // Output sequential pixels
     JPEG_DONE,
     JPEG_ERROR
 };
 
 void init_source(j_decompress_ptr jd);
 boolean fill_input_buffer(j_decompress_ptr jd);
 void skip_input_data(j_decompress_ptr jd, long num_bytes);
 void term_source(j_decompress_ptr jd);
-#if PLATFORM(QT)
-void error_exit(j_common_ptr) NO_RETURN;
-#else
 void error_exit(j_common_ptr cinfo);
-#endif
 
 // Implementation of a JPEG src object that understands our state machine
 struct decoder_source_mgr {
     // public fields; must be first in this struct!
     struct jpeg_source_mgr pub;
 
     JPEGImageReader* decoder;
 };
 
 static unsigned readUint16(JOCTET* data, bool isBigEndian)
@@ skipping 657 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 JPEGImageReader
     // anymore.  (If we failed, |m_reader| has already been cleared.)
     else if (!m_frameBufferCache.isEmpty() && (m_frameBufferCache[0].status() == ImageFrame::FrameComplete))
         m_reader.clear();
 }
 
 }