[parser] Hide expression classifiers in parser implementation

src/parsing/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_PARSING_EXPRESSION_CLASSIFIER_H
 #define V8_PARSING_EXPRESSION_CLASSIFIER_H
 
 #include "src/messages.h"
 #include "src/parsing/scanner.h"
 #include "src/parsing/token.h"
@@ skipping 339 matching lines @@
           reported_errors_->at(reported_errors_end_-1).kind =
               kArrowFormalParametersProduction;
         }
       }
     }
     reported_errors_->Rewind(reported_errors_end_);
     inner->reported_errors_begin_ = inner->reported_errors_end_ =
         reported_errors_end_;
   }
 
-  // Accumulate errors that can be arbitrarily deep in an expression.
-  // These correspond to the ECMAScript spec's 'Contains' operation
-  // on productions. This includes:
-  //
-  // - YieldExpression is disallowed in arrow parameters in a generator.
-  // - AwaitExpression is disallowed in arrow parameters in an async function.
-  // - AwaitExpression is disallowed in async arrow parameters.
-  //
-  V8_INLINE void AccumulateFormalParameterContainmentErrors(
-      ExpressionClassifier* inner) {
-    Accumulate(inner, FormalParameterInitializerProduction |
-                          AsyncArrowFormalParametersProduction);
-  }
-
   V8_INLINE int GetNonPatternBegin() const { return non_pattern_begin_; }
 
   V8_INLINE void Discard() {
     if (reported_errors_end_ == reported_errors_->length()) {
       reported_errors_->Rewind(reported_errors_begin_);
       reported_errors_end_ = reported_errors_begin_;
     }
     DCHECK_EQ(reported_errors_begin_, reported_errors_end_);
     DCHECK_LE(non_pattern_begin_, non_patterns_to_rewrite_->length());
     non_patterns_to_rewrite_->Rewind(non_pattern_begin_);
@@ skipping 60 matching lines @@
 };
 
 
 #undef ERROR_CODES
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_EXPRESSION_CLASSIFIER_H