Reland "Clear highlight when the highlighted node gets removed from the document"

Source/WebKit/chromium/src/LinkHighlight.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 317 matching lines @@
     m_geometryNeedsUpdate = false;
 
     RenderLayer* compositingLayer = computeEnclosingCompositingLayer();
     if (compositingLayer && computeHighlightLayerPathAndPosition(compositingLayer)) {
         // We only need to invalidate the layer if the highlight size has changed, otherwise
         // we can just re-position the layer without needing to repaint.
         m_contentLayer->layer()->invalidate();
 
         if (m_currentGraphicsLayer)
             m_currentGraphicsLayer->addRepaintRect(FloatRect(layer()->position().x, layer()->position().y, layer()->bounds().width, layer()->bounds().height));
+    } else {
+        clearGraphicsLayerLinkHighlightPointer();
+        releaseResources();
     }
 }
 
 void LinkHighlight::clearCurrentGraphicsLayer()
 {
     m_currentGraphicsLayer = 0;
     m_geometryNeedsUpdate = true;
 }
 
 void LinkHighlight::invalidate()
 {
     // Make sure we update geometry on the next callback from WebViewImpl::layout().
     m_geometryNeedsUpdate = true;
 }
 
 WebLayer* LinkHighlight::layer()
 {
     return clipLayer();
 }
 
 } // namespace WeKit