Trim FontSelector interface a bit.

Source/platform/fonts/FontCache.h

 /*
  * Copyright (C) 2006, 2008 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007-2008 Torch Mobile, Inc.
  *
  * 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.
@@ skipping 36 matching lines @@
 #endif
 
 #if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS)
 #include "SkFontMgr.h"
 #endif
 
 class SkTypeface;
 
 namespace WebCore {
 
+class FontCacheClient;
 class FontPlatformData;
 class FontData;
 class FontDescription;
-class FontSelector;
 class OpenTypeVerticalData;
 class SimpleFontData;
 
 enum ShouldRetain { Retain, DoNotRetain };
 enum PurgeSeverity { PurgeIfNeeded, ForcePurge };
 
 class PLATFORM_EXPORT FontCache {
     friend class FontCachePurgePreventer;
 
     WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED;
 public:
     static FontCache* fontCache();
 
     void releaseFontData(const SimpleFontData*);
 
     // This method is implemented by the plaform and used by
     // FontFastPath to lookup the font for a given character.
     PassRefPtr<SimpleFontData> platformFallbackForCharacter(const FontDescription&, UChar32, const SimpleFontData* fontDataToSubstitute, bool disallowSynthetics);
 
     // Also implemented by the platform.
     void platformInit();
 
     PassRefPtr<SimpleFontData> getFontData(const FontDescription&, const AtomicString&, bool checkingAlternateName = false, ShouldRetain = Retain);
     PassRefPtr<SimpleFontData> getLastResortFallbackFont(const FontDescription&, ShouldRetain = Retain);
     SimpleFontData* getNonRetainedLastResortFallbackFont(const FontDescription&);
     bool isPlatformFontAvailable(const FontDescription&, const AtomicString&);
 
-    void addClient(FontSelector*);
-    void removeClient(FontSelector*);
+    void addClient(FontCacheClient*);
+    void removeClient(FontCacheClient*);
 
     unsigned short generation();
     void invalidate();
 
 #if OS(WIN)
     PassRefPtr<SimpleFontData> fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT&, wchar_t* outFontFamilyName);
 #endif
 
 #if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS)
     bool useSubpixelPositioning() const { return m_useSubpixelPositioning; }
@@ skipping 58 matching lines @@
 
 class PLATFORM_EXPORT FontCachePurgePreventer {
 public:
     FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
     ~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
 };
 
 }
 
 #endif