Allow assertions to be enabled in Blink Release builds.

Source/core/rendering/compositing/GraphicsLayerUpdater.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 106 matching lines @@
             updateType = mapping->updateTypeForChildren(updateType);
             mapping->clearNeedsGraphicsLayerUpdate();
         }
     }
 
     UpdateContext childContext(context, layer);
     for (RenderLayer* child = layer.firstChild(); child; child = child->nextSibling())
         updateRecursive(*child, updateType, childContext, layersNeedingPaintInvalidation);
 }
 
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
 
 void GraphicsLayerUpdater::assertNeedsToUpdateGraphicsLayerBitsCleared(RenderLayer& layer)
 {
     if (layer.hasCompositedLayerMapping())
         layer.compositedLayerMapping()->assertNeedsToUpdateGraphicsLayerBitsCleared();
 
     for (RenderLayer* child = layer.firstChild(); child; child = child->nextSibling())
         assertNeedsToUpdateGraphicsLayerBitsCleared(*child);
 }
 
 #endif
 
 } // namespace WebCore