Use unicode-range to prevent unnecessary @font-face donwnloads

Source/core/css/CSSFontFace.h

Index: Source/core/css/CSSFontFace.h
diff --git a/Source/core/css/CSSFontFace.h b/Source/core/css/CSSFontFace.h
index 1b40b34f2da2dc5fb1cc51a7d0d30e6621e6c6cf..21ab58a901c76373e6e4f3cb7671aa059f63699e 100644
--- a/Source/core/css/CSSFontFace.h
+++ b/Source/core/css/CSSFontFace.h
@@ -37,6 +37,7 @@ namespace WebCore {
 
 class CSSSegmentedFontFace;
 class FontDescription;
+class FontResource;
 class SimpleFontData;
 
 class CSSFontFace : public RefCounted<CSSFontFace> {
@@ -56,6 +57,7 @@ public:
 
     void addSource(PassOwnPtr<CSSFontFaceSource>);
 
+    void beginLoadingFontSoon(FontResource*);
     void fontLoaded(CSSFontFaceSource*);
 
     PassRefPtr<SimpleFontData> getFontData(const FontDescription&, bool syntheticBold, bool syntheticItalic);