Start removing the double-negative !ASSERT_DISABLED

Source/core/rendering/compositing/CompositingRequirementsUpdater.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 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 309 matching lines @@
 
         // Here we know that all children and the layer's own contents can blindly paint into
         // this layer's backing, until a descendant is composited. So, we don't need to check
         // for overlap with anything behind this layer.
         overlapMap.beginNewOverlapTestingContext();
         // This layer is going to be composited, so children can safely ignore the fact that there's an
         // animation running behind this layer, meaning they can rely on the overlap map testing again.
         childRecursionData.m_testingOverlap = true;
     }
 
-#if !ASSERT_DISABLED
+#if ASSERT_ENABLED
     LayerListMutationDetector mutationChecker(layer->stackingNode());
 #endif
 
     bool anyDescendantHas3DTransform = false;
     bool willHaveForegroundLayer = false;
 
     if (layer->stackingNode()->isStackingContext()) {
         RenderLayerStackingNodeIterator iterator(*layer->stackingNode(), NegativeZOrderChildren);
         while (RenderLayerStackingNode* curNode = iterator.next()) {
             IntRect absoluteChildDecendantBoundingBox;
@@ skipping 116 matching lines @@
     layer->setCompositingReasons(reasonsToComposite);
 
 }
 
 bool CompositingRequirementsUpdater::isRunningAcceleratedTransformAnimation(RenderObject* renderer) const
 {
     return renderer->style()->hasCurrentTransformAnimation();
 }
 
 } // namespace WebCore