Remove unused m_src from FontFace class.

third_party/WebKit/Source/core/css/FontFace.cpp

 /*
  * Copyright (C) 2013 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 577 matching lines @@
     OwnPtrWillBeRawPtr<BinaryDataFontFaceSource> source = adoptPtrWillBeNoop(new BinaryDataFontFaceSource(buffer.get(), m_otsParseMessage));
     if (source->isValid())
         setLoadStatus(Loaded);
     else
         setError(DOMException::create(SyntaxError, "Invalid font data in ArrayBuffer."));
     m_cssFontFace->addSource(source.release());
 }
 
 DEFINE_TRACE(FontFace)
 {
-    visitor->trace(m_src);
     visitor->trace(m_style);
     visitor->trace(m_weight);
     visitor->trace(m_stretch);
     visitor->trace(m_unicodeRange);
     visitor->trace(m_variant);
     visitor->trace(m_featureSettings);
     visitor->trace(m_error);
     visitor->trace(m_loadedProperty);
     visitor->trace(m_cssFontFace);
     visitor->trace(m_callbacks);
     ActiveDOMObject::trace(visitor);
 }
 
 bool FontFace::hadBlankText() const
 {
     return m_cssFontFace->hadBlankText();
 }
 
 bool FontFace::hasPendingActivity() const
 {
     return m_status == Loading && executionContext() && !executionContext()->activeDOMObjectsAreStopped();
 }
 
 } // namespace blink