Trim FontSelector interface a bit.

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 21 matching lines @@
 #include "platform/fonts/FontSelector.h"
 #include "platform/fonts/GenericFontFamilySettings.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 
 namespace WebCore {
 
 class CSSFontFace;
 class CSSFontFaceRule;
+class CSSFontSelectorClient;
 class CSSSegmentedFontFace;
 class FontResource;
 class Document;
 class FontDescription;
 class StyleRuleFontFace;
 
 class FontLoader {
 public:
     explicit FontLoader(ResourceFetcher*);
 
@@ skipping 22 matching lines @@
 
     virtual PassRefPtr<FontData> getFontData(const FontDescription&, const AtomicString&) OVERRIDE;
     virtual void willUseFontData(const FontDescription&, const AtomicString& family) OVERRIDE;
 
     void clearDocument();
 
     void addFontFaceRule(const StyleRuleFontFace*, PassRefPtr<CSSFontFace>);
     void removeFontFaceRule(const StyleRuleFontFace*);
 
     void fontLoaded();
+
+    // FontCacheClient implementation
     virtual void fontCacheInvalidated() OVERRIDE;
 
-    virtual void registerForInvalidationCallbacks(FontSelectorClient*) OVERRIDE;
-    virtual void unregisterForInvalidationCallbacks(FontSelectorClient*) OVERRIDE;
+    void registerForInvalidationCallbacks(CSSFontSelectorClient*);
+    void unregisterForInvalidationCallbacks(CSSFontSelectorClient*);
 
     Document* document() const { return m_document; }
     CSSSegmentedFontFaceCache* cssSegmentedFontFaceCache() { return &m_cssSegmentedFontFaceCache; }
 
     const GenericFontFamilySettings& genericFontFamilySettings() const { return m_genericFontFamilySettings; }
 
     void beginLoadingFontSoon(FontResource*);
     void loadPendingFonts();
 
 private:
     explicit CSSFontSelector(Document*);
 
     void dispatchInvalidationCallbacks();
 
     Document* m_document;
     // FIXME: Move to Document or StyleEngine.
     CSSSegmentedFontFaceCache m_cssSegmentedFontFaceCache;
-    HashSet<FontSelectorClient*> m_clients;
+    HashSet<CSSFontSelectorClient*> m_clients;
 
     FontLoader m_fontLoader;
     GenericFontFamilySettings m_genericFontFamilySettings;
 };
 
 } // namespace WebCore
 
 #endif // CSSFontSelector_h