Disentangle filter content recording state from FilterData

Source/core/layout/svg/LayoutSVGResourceFilter.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 24 matching lines @@
 DEFINE_TRACE(FilterData)
 {
 #if ENABLE(OILPAN)
     visitor->trace(filter);
     visitor->trace(builder);
 #endif
 }
 
 void FilterData::dispose()
 {
-    m_context.clear();
-    m_displayItemList.clear();
     builder = nullptr;
     filter = nullptr;
 }
 
 LayoutSVGResourceFilter::LayoutSVGResourceFilter(SVGFilterElement* node)
     : LayoutSVGResourceContainer(node)
 {
 }
 
 LayoutSVGResourceFilter::~LayoutSVGResourceFilter()
@@ skipping 100 matching lines @@
             return;
         builder->clearResultsRecursive(effect);
 
         // Issue paint invalidations for the image on the screen.
         markClientForInvalidation(it->key, PaintInvalidation);
     }
     markAllClientLayersForInvalidation();
 }
 
 } // namespace blink