Always use user preference font before system fallback

third_party/WebKit/Source/platform/fonts/FontFallbackList.h

 /*
  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 113 matching lines @@
 
     mutable Vector<RefPtr<FontData>, 1> m_fontList;
     GlyphPages m_pages;
     GlyphPageTreeNodeBase* m_pageZero;
     mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
     RefPtrWillBePersistent<FontSelector> m_fontSelector;
     unsigned m_fontSelectorVersion;
     mutable int m_familyIndex;
     unsigned short m_generation;
     mutable bool m_hasLoadingFallback : 1;
+    mutable bool m_hasNonBlankFontData : 1;
     mutable WeakPtr<ShapeCache> m_shapeCache;
 };
 
 } // namespace blink
 
 #endif