[parser] Delete has_seen_proto in ObjectLiteral.

src/parsing/parser-base.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_BASE_H
 #define V8_PARSING_PARSER_BASE_H
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/bailout-reason.h"
@@ skipping 2534 matching lines @@
 template <typename Impl>
 typename ParserBase<Impl>::ExpressionT ParserBase<Impl>::ParseObjectLiteral(
     bool* ok) {
   // ObjectLiteral ::
   // '{' (PropertyDefinition (',' PropertyDefinition)* ','? )? '}'
 
   int pos = peek_position();
   typename Types::ObjectPropertyList properties =
       impl()->NewObjectPropertyList(4);
   int number_of_boilerplate_properties = 0;
-  bool has_seen_proto = false;
 
   bool has_computed_names = false;
   bool has_rest_property = false;
   ObjectLiteralChecker checker(this);
 
   Expect(Token::LBRACE, CHECK_OK);
 
   while (peek() != Token::RBRACE) {
     FuncNameInferrer::State fni_state(fni_);
 
     bool is_computed_name = false;
     bool is_rest_property = false;
     ObjectLiteralPropertyT property = ParseObjectPropertyDefinition(
         &checker, &is_computed_name, &is_rest_property, CHECK_OK);
 
     if (is_computed_name) {
       has_computed_names = true;
     }
 
     if (is_rest_property) {
       has_rest_property = true;
     }
 
-    if (!impl()->IsBoilerplateProperty(property)) {
-      has_seen_proto = true;
-    } else if (!has_computed_names) {
+    if (impl()->IsBoilerplateProperty(property) && !has_computed_names) {
       // Count CONSTANT or COMPUTED properties to maintain the enumeration
       // order.
       number_of_boilerplate_properties++;
     }
 
     properties->Add(property, zone());
 
     if (peek() != Token::RBRACE) {
       // Need {} because of the CHECK_OK macro.
       Expect(Token::COMMA, CHECK_OK);
     }
 
     if (fni_ != nullptr) fni_->Infer();
   }
   Expect(Token::RBRACE, CHECK_OK);
 
   // Computation of literal_index must happen before pre parse bailout.
   int literal_index = function_state_->NextMaterializedLiteralIndex();
 
   return factory()->NewObjectLiteral(properties, literal_index,
-                                     number_of_boilerplate_properties,
-                                     has_seen_proto, pos, has_rest_property);
+                                     number_of_boilerplate_properties, pos,
+                                     has_rest_property);
 }
 
 template <typename Impl>
 typename ParserBase<Impl>::ExpressionListT ParserBase<Impl>::ParseArguments(
     Scanner::Location* first_spread_arg_loc, bool maybe_arrow, bool* ok) {
   // Arguments ::
   //   '(' (AssignmentExpression)*[','] ')'
 
   Scanner::Location spread_arg = Scanner::Location::invalid();
   ExpressionListT result = impl()->NewExpressionList(4);
@@ skipping 3067 matching lines @@
     return;
   }
 }
 
 #undef CHECK_OK_VOID
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARSER_BASE_H