Use removeFontFace to avoid resetting fontSelector.

Source/core/css/CSSFontSelector.h

 /*
  * Copyright (C) 2007, 2008, 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 72 matching lines @@
     // FontCacheClient implementation
     virtual void fontCacheInvalidated() OVERRIDE;
 
     void registerForInvalidationCallbacks(CSSFontSelectorClient*);
     void unregisterForInvalidationCallbacks(CSSFontSelectorClient*);
 
     Document* document() const { return m_document; }
     CSSSegmentedFontFaceCache* fontFaceCache() { return &m_cssSegmentedFontFaceCache; }
 
     const GenericFontFamilySettings& genericFontFamilySettings() const { return m_genericFontFamilySettings; }
+    void updateGenericFontFamilySettings(Document&);

[dglazkov, 2014/01/29 05:11:50]

This sounds terrifying. Why do we ever need to do that? Can you please explain?

[tasak, 2014/01/29 10:13:43]

So would you help me to fix
fast/text/international/content-language-font-selection.html's regression?

The test uses "window.internals.settings.setStandardFontFamily("Ahem",
"Hant");".

So if we don't update GenericFontFamilySettings, the test will fail.

I'm not sure whether I can modify the layout test or not.

 
     void beginLoadingFontSoon(FontResource*);
     void loadPendingFonts();
 
 private:
     explicit CSSFontSelector(Document*);
 
     void dispatchInvalidationCallbacks();
 
     Document* m_document;
     // FIXME: Move to Document or StyleEngine.
     CSSSegmentedFontFaceCache m_cssSegmentedFontFaceCache;
     HashSet<CSSFontSelectorClient*> m_clients;
 
     FontLoader m_fontLoader;
     GenericFontFamilySettings m_genericFontFamilySettings;
 };
 
 } // namespace WebCore
 
 #endif // CSSFontSelector_h