[css-font-loading-3] Remove variant attribute, fix w3c#7502

Author: svgeesus

css-font-loading-3/Overview.bs

@@ -87,7 +87,6 @@ The <code>FontFace</code> Interface</h2>
 			CSSOMString weight = "normal";
 			CSSOMString stretch = "normal";
 			CSSOMString unicodeRange = "U+0-10FFFF";
-			CSSOMString variant = "normal";
 			CSSOMString featureSettings = "normal";
 			CSSOMString variationSettings = "normal";
 			CSSOMString display = "auto";
@@ -107,7 +106,6 @@ The <code>FontFace</code> Interface</h2>
 			attribute CSSOMString weight;
 			attribute CSSOMString stretch;
 			attribute CSSOMString unicodeRange;
-			attribute CSSOMString variant;
 			attribute CSSOMString featureSettings;
 			attribute CSSOMString variationSettings;
 			attribute CSSOMString display;
@@ -149,7 +147,6 @@ The <code>FontFace</code> Interface</h2>
 			throw a {{SyntaxError}};
 			otherwise, set the attribute to the serialization of the parsed value.
 
-		: <dfn>variant</dfn>
 		: <dfn>featureSettings</dfn>
 		: <dfn>variationSettings</dfn>
 		: <dfn>display</dfn>