Use removeFontFace to avoid resetting fontSelector.

Source/core/frame/Settings.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 35 matching lines @@
     EditableLinkLiveWhenNotFocused,
     EditableLinkNeverLive
 };
 
 class Settings {
     WTF_MAKE_NONCOPYABLE(Settings); WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<Settings> create();
 
     GenericFontFamilySettings& genericFontFamilySettings() { return m_genericFontFamilySettings; }
+    void notifyGenericFontFamilyChange() { invalidate(SettingsDelegate::FontFamilyChange); }
 
     void setTextAutosizingEnabled(bool);
     bool textAutosizingEnabled() const { return m_textAutosizingEnabled; }
 
     // Only set by Layout Tests, and only used if textAutosizingEnabled() returns true.
     void setTextAutosizingWindowSizeOverride(const IntSize&);
     const IntSize& textAutosizingWindowSizeOverride() const { return m_textAutosizingWindowSizeOverride; }
 
     SETTINGS_GETTERS_AND_SETTERS
 
@@ skipping 19 matching lines @@
     bool m_openGLMultisamplingEnabled : 1;
     IntSize m_textAutosizingWindowSizeOverride;
     bool m_textAutosizingEnabled : 1;
 
     SETTINGS_MEMBER_VARIABLES
 };
 
 } // namespace WebCore
 
 #endif // Settings_h