[parser] Delete has_seen_proto in ObjectLiteral.

src/parsing/preparser.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_PREPARSER_H
 #define V8_PARSING_PREPARSER_H
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser-base.h"
@@ skipping 577 matching lines @@
                                                bool is_computed_name) {
     return PreParserExpression::Default(value.variables_);
   }
   PreParserExpression NewObjectLiteralProperty(PreParserExpression key,
                                                PreParserExpression value,
                                                bool is_computed_name) {
     return PreParserExpression::Default(value.variables_);
   }
   PreParserExpression NewObjectLiteral(PreParserExpressionList properties,
                                        int literal_index,
-                                       int boilerplate_properties,
-                                       bool has_seen_proto, int pos,
+                                       int boilerplate_properties, int pos,
                                        bool has_rest_property) {
     return PreParserExpression::ObjectLiteral(properties.variables_);
   }
   PreParserExpression NewVariableProxy(void* variable) {
     return PreParserExpression::Default();
   }
   PreParserExpression NewProperty(PreParserExpression obj,
                                   PreParserExpression key,
                                   int pos) {
     if (obj.IsThis()) {
@@ skipping 1046 matching lines @@
     function_state_->NextMaterializedLiteralIndex();
     function_state_->NextMaterializedLiteralIndex();
   }
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H