Allow assertions to be enabled in Blink Release builds.

Source/core/rendering/RenderLayerClipper.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 106 matching lines @@
     ASSERT(clipRects == *entry.clipRects);
 #endif
 
     return entry.clipRects.get();
 }
 
 ClipRects* RenderLayerClipper::storeClipRectsInCache(const ClipRectsContext& context, ClipRects* parentClipRects, const ClipRects& clipRects) const
 {
     ClipRectsCache::Entry& entry = cache().get(context.cacheSlot);
     entry.root = context.rootLayer;
-#if ASSERT_ENABLED
+#if ENABLE(ASSERT)
     entry.scrollbarRelevancy = context.scrollbarRelevancy;
 #endif
 
     if (parentClipRects) {
         // If our clip rects match the clip rects of our parent, we share storage.
         if (clipRects == *parentClipRects) {
             entry.clipRects = parentClipRects;
             return parentClipRects;
         }
     }
@@ skipping 233 matching lines @@
         ASSERT(current);
         if (current->transform() || current->isPaintInvalidationContainer())
             return const_cast<RenderLayer*>(current);
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace WebCore