Move webfont usage metrics reporting to FontResource

Source/core/css/CSSFontFaceSource.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 62 matching lines @@
 #endif
 
     bool isDecodeError() const;
     bool ensureFontData();
     bool isLocalFontAvailable(const FontDescription&);
     void willUseFontData();
 
 private:
     class FontLoadHistograms {
     public:
-        enum UsageType {
-            StyledAndUsed,
-            StyledButNotUsed,
-            NotStyledButUsed,
-            UsageTypeMax
-        };
-        FontLoadHistograms() : m_styledTime(0), m_loadStartTime(0) { }
-        ~FontLoadHistograms();
+        FontLoadHistograms() : m_loadStartTime(0) { }
         void willUseFontData();
         void loadStarted();
         void recordLocalFont(bool loadSuccess);
         void recordRemoteFont(const FontResource*);
     private:
         const char* histogramName(const FontResource*);
-        double m_styledTime;
         double m_loadStartTime;
     };
 
     void startLoadingTimerFired(Timer<CSSFontFaceSource>*);
 
     AtomicString m_string; // URI for remote, built-in font name for local.
     ResourcePtr<FontResource> m_font; // For remote fonts, a pointer to our cached resource.
     CSSFontFace* m_face; // Our owning font face.
     HashMap<unsigned, RefPtr<SimpleFontData> > m_fontDataTable; // The hash key is composed of size synthetic styles.
     FontLoadHistograms m_histograms;
 
 #if ENABLE(SVG_FONTS)
     RefPtr<SVGFontFaceElement> m_svgFontFaceElement;
     RefPtr<SVGFontElement> m_externalSVGFontElement;
     bool m_hasExternalSVGFont;
 #endif
 };
 
 }
 
 #endif