Use removeFontFace to avoid resetting fontSelector.

Source/core/frame/Settings.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011, 2012 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 81 matching lines @@
     if (m_delegate)
         m_delegate->settingsChanged(changeType);
 }
 
 void Settings::setTextAutosizingEnabled(bool textAutosizingEnabled)
 {
     if (m_textAutosizingEnabled == textAutosizingEnabled)
         return;
 
     m_textAutosizingEnabled = textAutosizingEnabled;
-    invalidate(SettingsDelegate::StyleChange);
+    invalidate(SettingsDelegate::TextAutosizingChange);
 }
 
 // FIXME: Move to Settings.in once make_settings can understand IntSize.
 void Settings::setTextAutosizingWindowSizeOverride(const IntSize& textAutosizingWindowSizeOverride)
 {
     if (m_textAutosizingWindowSizeOverride == textAutosizingWindowSizeOverride)
         return;
 
     m_textAutosizingWindowSizeOverride = textAutosizingWindowSizeOverride;
-    invalidate(SettingsDelegate::StyleChange);
+    invalidate(SettingsDelegate::TextAutosizingChange);
 }
 
 void Settings::setMockScrollbarsEnabled(bool flag)
 {
     ScrollbarTheme::setMockScrollbarsEnabled(flag);
 }
 
 bool Settings::mockScrollbarsEnabled()
 {
     return ScrollbarTheme::mockScrollbarsEnabled();
 }
 
 void Settings::setOpenGLMultisamplingEnabled(bool flag)
 {
     if (m_openGLMultisamplingEnabled == flag)
         return;
 
     m_openGLMultisamplingEnabled = flag;
     invalidate(SettingsDelegate::MultisamplingChange);
 }
 
 } // namespace WebCore