Use removeFontFace to avoid resetting fontSelector.

Source/platform/fonts/FontDescription.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  *
  * 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
@@ skipping 102 matching lines @@
     float specifiedSize() const { return m_specifiedSize; }
     float computedSize() const { return m_computedSize; }
     FontItalic italic() const { return static_cast<FontItalic>(m_italic); }
     int computedPixelSize() const { return int(m_computedSize + 0.5f); }
     FontSmallCaps smallCaps() const { return static_cast<FontSmallCaps>(m_smallCaps); }
     bool isAbsoluteSize() const { return m_isAbsoluteSize; }
     FontWeight weight() const { return static_cast<FontWeight>(m_weight); }
     FontWeight lighterWeight() const;
     FontWeight bolderWeight() const;
     GenericFamilyType genericFamily() const { return static_cast<GenericFamilyType>(m_genericFamily); }
+#if OS(MACOSX)
+    bool usePrinterFont() const { return false; }
+#else
     bool usePrinterFont() const { return m_usePrinterFont; }
+#endif
     // only use fixed default size when there is only one font family, and that family is "monospace"
     bool useFixedDefaultSize() const { return genericFamily() == MonospaceFamily && !family().next() && family().family() == FontFamilyNames::webkit_monospace; }
     Kerning kerning() const { return static_cast<Kerning>(m_kerning); }
     LigaturesState commonLigaturesState() const { return static_cast<LigaturesState>(m_commonLigaturesState); }
     LigaturesState discretionaryLigaturesState() const { return static_cast<LigaturesState>(m_discretionaryLigaturesState); }
     LigaturesState historicalLigaturesState() const { return static_cast<LigaturesState>(m_historicalLigaturesState); }
     unsigned keywordSize() const { return m_keywordSize; }
     FontSmoothingMode fontSmoothing() const { return static_cast<FontSmoothingMode>(m_fontSmoothing); }
     TextRenderingMode textRenderingMode() const { return static_cast<TextRenderingMode>(m_textRendering); }
     UScriptCode script() const { return static_cast<UScriptCode>(m_script); }
@@ skipping 17 matching lines @@
     void setFamily(const FontFamily& family) { m_familyList = family; }
     void setComputedSize(float s) { m_computedSize = clampToFloat(s); }
     void setSpecifiedSize(float s) { m_specifiedSize = clampToFloat(s); }
     void setItalic(FontItalic i) { m_italic = i; }
     void setItalic(bool i) { setItalic(i ? FontItalicOn : FontItalicOff); }
     void setSmallCaps(FontSmallCaps c) { m_smallCaps = c; }
     void setSmallCaps(bool c) { setSmallCaps(c ? FontSmallCapsOn : FontSmallCapsOff); }
     void setIsAbsoluteSize(bool s) { m_isAbsoluteSize = s; }
     void setWeight(FontWeight w) { m_weight = w; }
     void setGenericFamily(GenericFamilyType genericFamily) { m_genericFamily = genericFamily; }
-#if OS(MACOSX)
-    void setUsePrinterFont(bool) { }
-#else
     void setUsePrinterFont(bool p) { m_usePrinterFont = p; }
-#endif
     void setKerning(Kerning kerning) { m_kerning = kerning; updateTypesettingFeatures(); }
     void setCommonLigaturesState(LigaturesState commonLigaturesState) { m_commonLigaturesState = commonLigaturesState; updateTypesettingFeatures(); }
     void setDiscretionaryLigaturesState(LigaturesState discretionaryLigaturesState) { m_discretionaryLigaturesState = discretionaryLigaturesState; }
     void setHistoricalLigaturesState(LigaturesState historicalLigaturesState) { m_historicalLigaturesState = historicalLigaturesState; }
     void setKeywordSize(unsigned s) { m_keywordSize = s; }
     void setFontSmoothing(FontSmoothingMode smoothing) { m_fontSmoothing = smoothing; }
     void setTextRenderingMode(TextRenderingMode rendering) { m_textRendering = rendering; updateTypesettingFeatures(); }
     void setIsSpecifiedFont(bool isSpecifiedFont) { m_isSpecifiedFont = isSpecifiedFont; }
     void setOrientation(FontOrientation orientation) { m_orientation = orientation; }
     void setNonCJKGlyphOrientation(NonCJKGlyphOrientation orientation) { m_nonCJKGlyphOrientation = orientation; }
@@ skipping 92 matching lines @@
         && m_script == other.m_script
         && m_syntheticBold == other.m_syntheticBold
         && m_syntheticItalic == other.m_syntheticItalic
         && m_featureSettings == other.m_featureSettings
         && m_subpixelTextPosition == other.m_subpixelTextPosition;
 }
 
 }
 
 #endif