Remove class fields desugaring

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 026ea069895118363d6b8fbf77e846cbec05988b..5a9e8fef65540dd2c772a1e85621d2867484d0be 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -322,8 +322,6 @@ class PreParserExpression {
   int position() const { return kNoSourcePosition; }
   void set_function_token_position(int position) {}
 
-  void set_is_class_field_initializer(bool is_class_field_initializer) {}
-
  private:
   enum Type {
     kEmpty,
@@ -974,11 +972,6 @@ class PreParser : public ParserBase<PreParser> {
                                               PreParserExpressionList args,
                                               int pos);
 
-  V8_INLINE PreParserExpression
-  RewriteSuperCall(PreParserExpression call_expression) {
-    return call_expression;
-  }
-
   V8_INLINE void RewriteDestructuringAssignments() {}
 
   V8_INLINE PreParserExpression RewriteExponentiation(PreParserExpression left,
@@ -1083,23 +1076,13 @@ class PreParser : public ParserBase<PreParser> {
                                       ClassLiteralProperty::Kind kind,
                                       bool is_static, bool is_constructor,
                                       ClassInfo* class_info, bool* ok) {
-    if (kind == ClassLiteralProperty::FIELD && !is_static && !is_constructor) {
-      class_info->instance_field_initializers->Add(
-          PreParserExpression::Default(), zone());
-    }
   }
   V8_INLINE PreParserExpression RewriteClassLiteral(PreParserIdentifier name,
                                                     ClassInfo* class_info,
                                                     int pos, bool* ok) {
     bool has_default_constructor = !class_info->has_seen_constructor;
-    bool has_instance_fields =
-        class_info->instance_field_initializers->length() > 0;
     // Account for the default constructor.
     if (has_default_constructor) GetNextFunctionLiteralId();
-    if (allow_harmony_class_fields() && has_instance_fields) {
-      // Account for initializer function.
-      GetNextFunctionLiteralId();
-    }
     return PreParserExpression::Default();
   }