Revert "Issue 27300. Report HintCode.ABSTRACT_SUPER_MEMBER_REFERENCE."

pkg/analyzer/lib/src/error/codes.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.src.error.codes;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 
 /**
@@ skipping 2186 matching lines @@
   @override
   ErrorType get type => ErrorType.COMPILE_TIME_ERROR;
 }
 
 /**
  * The hints and coding recommendations for best practices which are not
  * mentioned in the Dart Language Specification.
  */
 class HintCode extends ErrorCode {
   /**
-   * When an abstract supertype member is references with `super` as its target,
-   * it cannot be overridden, so it is always a runtime error.
-   *
-   * Parameters:
-   * 0: the display name for the kind of the referenced element
-   * 1: the name of the referenced element
-   */
-  static const HintCode ABSTRACT_SUPER_MEMBER_REFERENCE = const HintCode(
-      'ABSTRACT_SUPER_MEMBER_REFERENCE',
-      "The {0} '{1}' is always abstract in the supertype.",
-      null);
-
-  /**
    * This hint is generated anywhere where the
    * [StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE] would have been generated,
    * if we used propagated information for the warnings.
    *
    * Parameters:
    * 0: the name of the actual argument type
    * 1: the name of the expected type
    */
   static const HintCode ARGUMENT_TYPE_NOT_ASSIGNABLE = const HintCode(
       'ARGUMENT_TYPE_NOT_ASSIGNABLE',
@@ skipping 2635 matching lines @@
    * Initialize a newly created error code to have the given [name].
    */
   const TodoCode(String name) : super(name, "{0}");
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.INFO;
 
   @override
   ErrorType get type => ErrorType.TODO;
 }