Sync CSS interfaces with the specs

Source/core/css/CSSFontFaceRule.idl

Index: Source/core/css/CSSFontFaceRule.idl
diff --git a/Source/core/css/CSSFontFaceRule.idl b/Source/core/css/CSSFontFaceRule.idl
index f13497c437f6aee1d6627063f3054cbb6a921c0b..6d2ece7ddfba554405f6cabfc0ca1ef52fba9c12 100644
--- a/Source/core/css/CSSFontFaceRule.idl
+++ b/Source/core/css/CSSFontFaceRule.idl
@@ -18,8 +18,14 @@
  * Boston, MA 02110-1301, USA.
  */
 
-// Introduced in DOM Level 2:
+// The CSSFontFaceRule interface was introduced in DOM Level 2 Style, but has
+// been replaced by an entirely different interface in CSS Fonts:
+// http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSFontFaceRule
+// http://dev.w3.org/csswg/css-fonts/#om-fontface
+//
+// The interface from DOM Level 2 Style is implemented here.
+// TODO(philipj): Implement the interface from CSS Fonts.
+
 interface CSSFontFaceRule : CSSRule {
     readonly attribute CSSStyleDeclaration style;
 };
-