Unprefix CSS Variables

Source/core/css/CSSGrammar.y.in

Index: Source/core/css/CSSGrammar.y.in
diff --git a/Source/core/css/CSSGrammar.y.in b/Source/core/css/CSSGrammar.y.in
index 77d56691c27d12b5653215bc4bdbf322931767f0..75786d133c70685e6606ac23f93b8346c8e0edf2 100644
--- a/Source/core/css/CSSGrammar.y.in
+++ b/Source/core/css/CSSGrammar.y.in
@@ -77,6 +77,7 @@ static inline bool isCSSTokenAString(int yytype)
     case CALCFUNCTION:
     case MINFUNCTION:
     case MAXFUNCTION:
+    case VARFUNCTION:
     case VAR_DEFINITION:
     case UNICODERANGE:
         return true;
@@ -132,7 +133,6 @@ inline static CSSParserValue makeOperatorValue(int value)
 %token HOST_SYM
 %token CHARSET_SYM
 %token NAMESPACE_SYM
-%token VARFUNCTION
 %token VIEWPORT_RULE_SYM
 %token INTERNAL_DECLS_SYM
 %token INTERNAL_MEDIALIST_SYM
@@ -214,6 +214,7 @@ inline static CSSParserValue makeOperatorValue(int value)
 %token <string> CALCFUNCTION
 %token <string> MINFUNCTION
 %token <string> MAXFUNCTION
+%token <string> VARFUNCTION
 %token <string> VAR_DEFINITION
 
 %token <string> UNICODERANGE
@@ -1640,6 +1641,9 @@ term:
       $$.string = $3;
       $$.unit = CSSPrimitiveValue::CSS_VARIABLE_NAME;
   }
+  | VARFUNCTION maybe_space expr_recovery closing_parenthesis {
+      YYERROR;
+  }
   /* FIXME: according to the specs a function can have a unary_operator in front. I know no case where this makes sense */
   | function maybe_space {
       $$ = $1;