Improve error message for duplicate parameters

src/expression-classifier.h

 // Copyright 2015 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_EXPRESSION_CLASSIFIER_H
 #define V8_EXPRESSION_CLASSIFIER_H
 
 #include "src/v8.h"
 
 #include "src/messages.h"
@@ skipping 139 matching lines @@
     invalid_productions_ |= ArrowFormalParametersProduction;
     arrow_formal_parameters_error_.location = loc;
     arrow_formal_parameters_error_.message = message;
     arrow_formal_parameters_error_.arg = arg;
   }
 
   void RecordDuplicateFormalParameterError(const Scanner::Location& loc) {
     if (!is_valid_formal_parameter_list_without_duplicates()) return;
     invalid_productions_ |= DistinctFormalParametersProduction;
     duplicate_formal_parameter_error_.location = loc;
-    duplicate_formal_parameter_error_.message =
-        MessageTemplate::kStrictParamDupe;
+    duplicate_formal_parameter_error_.message = MessageTemplate::kParamDupe;
     duplicate_formal_parameter_error_.arg = nullptr;
   }
 
   // Record a binding that would be invalid in strict mode.  Confusingly this
   // is not the same as StrictFormalParameterList, which simply forbids
   // duplicate bindings.
   void RecordStrictModeFormalParameterError(const Scanner::Location& loc,
                                             MessageTemplate::Template message,
                                             const char* arg = nullptr) {
     if (!is_valid_strict_mode_formal_parameters()) return;
@@ skipping 74 matching lines @@
   Error arrow_formal_parameters_error_;
   Error duplicate_formal_parameter_error_;
   Error strict_mode_formal_parameter_error_;
   Error strong_mode_formal_parameter_error_;
   DuplicateFinder* duplicate_finder_;
 };
 }
 }  // v8::internal
 
 #endif  // V8_EXPRESSION_CLASSIFIER_H