Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

Source/core/css/CSSDefaultStyleSheets.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 24 matching lines @@
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/FullscreenElementStack.h"
 #include "core/html/HTMLAnchorElement.h"
 #include "core/html/HTMLHtmlElement.h"
 #include "core/rendering/RenderTheme.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
-DEFINE_GC_INFO(CSSDefaultStyleSheets);
-
 CSSDefaultStyleSheets& CSSDefaultStyleSheets::instance()
 {
 #if ENABLE(OILPAN)
     DEFINE_STATIC_LOCAL(Persistent<CSSDefaultStyleSheets>, cssDefaultStyleSheets, (new CSSDefaultStyleSheets()));
     return *cssDefaultStyleSheets;
 #else
     DEFINE_STATIC_LOCAL(CSSDefaultStyleSheets, cssDefaultStyleSheets, ());
     return cssDefaultStyleSheets;
 #endif
 }
@@ skipping 119 matching lines @@
 {
     visitor->trace(m_defaultStyleSheet);
     visitor->trace(m_viewportStyleSheet);
     visitor->trace(m_quirksStyleSheet);
     visitor->trace(m_svgStyleSheet);
     visitor->trace(m_mediaControlsStyleSheet);
     visitor->trace(m_fullscreenStyleSheet);
 }
 
 } // namespace WebCore