Allow assertions to be enabled in Blink Release builds.

Source/platform/fonts/GlyphPageTreeNode.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple 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 84 matching lines @@
 
     static size_t treeGlyphPageCount();
     size_t pageCount() const;
 
 private:
     GlyphPageTreeNode()
         : m_parent(0)
         , m_level(0)
         , m_isSystemFallback(false)
         , m_customFontCount(0)
-#ifndef NDEBUG
+#if ENABLE(ASSERT)
         , m_pageNumber(0)
 #endif
     {
     }
 
     static GlyphPageTreeNode* getRoot(unsigned pageNumber);
     void initializePage(const FontData*, unsigned pageNumber);
 
 #ifndef NDEBUG
     void showSubtree();
 #endif
 
     static HashMap<int, GlyphPageTreeNode*>* roots;
     static GlyphPageTreeNode* pageZeroRoot;
 
     typedef HashMap<const FontData*, OwnPtr<GlyphPageTreeNode> > GlyphPageTreeNodeMap;
 
     GlyphPageTreeNodeMap m_children;
     GlyphPageTreeNode* m_parent;
     RefPtr<GlyphPage> m_page;
     unsigned m_level : 31;
     bool m_isSystemFallback : 1;
     unsigned m_customFontCount;
     OwnPtr<GlyphPageTreeNode> m_systemFallbackChild;
 
+#if ENABLE(ASSERT)
+    unsigned m_pageNumber;
+#endif
 #ifndef NDEBUG
-    unsigned m_pageNumber;
-
     friend void ::showGlyphPageTrees();
     friend void ::showGlyphPageTree(unsigned pageNumber);
 #endif
 };
 
 } // namespace WebCore
 
 #endif // GlyphPageTreeNode_h