[parser] Delete misplaced const.

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 874 matching lines @@
             RuntimeCallStats* runtime_call_stats,
             bool parsing_on_main_thread = true)
       : ParserBase<PreParser>(zone, scanner, stack_limit, nullptr,
                               ast_value_factory, runtime_call_stats,
                               parsing_on_main_thread),
         use_counts_(nullptr),
         preparse_data_(FLAG_use_parse_tasks ? new PreParseData() : nullptr),
         track_unresolved_variables_(false),
         pending_error_handler_(pending_error_handler) {}
 
-  static bool const IsPreParser() { return true; }
+  static bool IsPreParser() { return true; }
 
   PreParserLogger* logger() { return &log_; }
 
   // Pre-parse the program from the character stream; returns true on
   // success (even if parsing failed, the pre-parse data successfully
   // captured the syntax error), and false if a stack-overflow happened
   // during parsing.
   PreParseResult PreParseProgram(bool is_module = false);
 
   // Parses a single function literal, from the opening parentheses before
@@ skipping 771 matching lines @@
 PreParserExpression PreParser::CloseTemplateLiteral(TemplateLiteralState* state,
                                                     int start,
                                                     PreParserExpression tag) {
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H