[parser] Clean up ParserBase typedefs

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index fa51e7a826c15e9ba928048faa9f24baa8798e9d..a8db6fedc6515f05319e352502bdacc817c8c1b6 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -599,19 +599,13 @@ struct ParserTypes<PreParser> {
   // PreParser doesn't need to store generator variables.
   typedef void GeneratorVariable;
 
-  typedef int AstProperties;
-
   // Return types for traversing functions.
   typedef PreParserIdentifier Identifier;
   typedef PreParserExpression Expression;
-  typedef PreParserExpression YieldExpression;
   typedef PreParserExpression FunctionLiteral;
-  typedef PreParserExpression ClassLiteral;
-  typedef PreParserExpression Literal;
   typedef PreParserExpression ObjectLiteralProperty;
   typedef PreParserExpressionList ExpressionList;
   typedef PreParserExpressionList PropertyList;
-  typedef PreParserIdentifier FormalParameter;
   typedef PreParserFormalParameters FormalParameters;
   typedef PreParserStatementList StatementList;
   typedef PreParserStatement Block;