Rely on ExpressionClassifier to match valid arrow function formals

src/ast.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_AST_H_
 #define V8_AST_H_
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 345 matching lines @@
   // True iff the expression is the null literal.
   bool IsNullLiteral() const;
 
   // True if we can prove that the expression is the undefined literal.
   bool IsUndefinedLiteral(Isolate* isolate) const;
 
   // Expression type bounds
   Bounds bounds() const { return bounds_; }
   void set_bounds(Bounds bounds) { bounds_ = bounds; }
 
-  // Whether the expression is parenthesized
-  bool is_single_parenthesized() const {
-    return IsSingleParenthesizedField::decode(bit_field_);
-  }
-  bool is_multi_parenthesized() const {
-    return IsMultiParenthesizedField::decode(bit_field_);
-  }
-  void increase_parenthesization_level() {
-    bit_field_ = IsMultiParenthesizedField::update(bit_field_,
-                                                   is_single_parenthesized());
-    bit_field_ = IsSingleParenthesizedField::update(bit_field_, true);
-  }
-
   // Type feedback information for assignments and properties.
   virtual bool IsMonomorphic() {
     UNREACHABLE();
     return false;
   }
   virtual SmallMapList* GetReceiverTypes() {
     UNREACHABLE();
     return NULL;
   }
   virtual KeyedAccessStoreMode GetStoreMode() const {
@@ skipping 31 matching lines @@
     DCHECK(!BailoutId(base_id_).IsNone());
     return base_id_;
   }
 
  private:
   int local_id(int n) const { return base_id() + parent_num_ids() + n; }
 
   int base_id_;
   Bounds bounds_;
   class ToBooleanTypesField : public BitField16<byte, 0, 8> {};
-  class IsSingleParenthesizedField : public BitField16<bool, 8, 1> {};
-  class IsMultiParenthesizedField : public BitField16<bool, 9, 1> {};
   uint16_t bit_field_;
   // Ends with 16-bit field; deriving classes in turn begin with
   // 16-bit fields for optimum packing efficiency.
 };
 
 
 class BreakableStatement : public Statement {
  public:
   enum BreakableType {
     TARGET_FOR_ANONYMOUS,
@@ skipping 3060 matching lines @@
 
  private:
   Zone* zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_