[parser] Refactor AstTraversalVisitor

src/parsing/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSING_PARSER_H_
 #define V8_PARSING_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
@@ skipping 837 matching lines @@
 
     Block* BuildInitializationBlock(ZoneList<const AstRawString*>* names,
                                     bool* ok);
 
     DeclarationDescriptor descriptor;
     List<Declaration> declarations;
     Scanner::Location first_initializer_loc;
     Scanner::Location bindings_loc;
   };
 
-  class PatternRewriter final : private AstVisitor<PatternRewriter> {
+  class PatternRewriter final : public AstVisitor<PatternRewriter> {
    public:
     static void DeclareAndInitializeVariables(
         Block* block, const DeclarationDescriptor* declaration_descriptor,
         const DeclarationParsingResult::Declaration* declaration,
         ZoneList<const AstRawString*>* names, bool* ok);
 
     static void RewriteDestructuringAssignment(Parser* parser,
                                                RewritableExpression* expr,
                                                Scope* Scope);
 
@@ skipping 446 matching lines @@
 
 DoExpression* ParserTraits::ParseDoExpression(bool* ok) {
   return parser_->ParseDoExpression(ok);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_H_