Remove more dead code

pkg/analysis_server/lib/src/provisional/refactoring/refactoring_core.dart

Index: pkg/analysis_server/lib/src/provisional/refactoring/refactoring_core.dart
diff --git a/pkg/analysis_server/lib/src/provisional/refactoring/refactoring_core.dart b/pkg/analysis_server/lib/src/provisional/refactoring/refactoring_core.dart
deleted file mode 100644
index e09ec3c0ceb4594d5230c48163cc4cbd9e97dac8..0000000000000000000000000000000000000000
--- a/pkg/analysis_server/lib/src/provisional/refactoring/refactoring_core.dart
+++ /dev/null
@@ -1,102 +0,0 @@
-// Copyright (c) 2015, 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.
-
-import 'dart:async';
-
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-
-/**
- * Abstract interface for all refactorings.
- */
-abstract class Refactoring {
-  /**
-   * Return the ids of source edits that are not known to be valid.
-   *
-   * An edit is not known to be valid if there was insufficient type information
-   * for the server to be able to determine whether or not the code needs to be
-   * modified, such as when a member is being renamed and there is a reference
-   * to a member from an unknown type. This field will be omitted if the change
-   * field is omitted or if there are no potential edits for the refactoring.
-   */
-  List<String> get potentialEditIds;
-
-  /**
-   * Return the human readable name of this refactoring.
-   */
-  String get refactoringName;
-
-  /**
-   * Checks all conditions - [checkInitialConditions] and
-   * [checkFinalConditions] to decide if refactoring can be performed.
-   */
-  Future<RefactoringStatus> checkAllConditions();
-
-  /**
-   * Validates environment to check if this refactoring can be performed.
-   *
-   * This check may be slow, because many refactorings use search engine.
-   */
-  Future<RefactoringStatus> checkFinalConditions();
-
-  /**
-   * Validates arguments to check if this refactoring can be performed.
-   *
-   * This check should be quick because it is used often as arguments change.
-   */
-  Future<RefactoringStatus> checkInitialConditions();
-
-  /**
-   * Return the [Change] to apply to perform this refactoring.
-   */
-  Future<SourceChange> createChange();
-
-  /**
-   * Return `true` if the [Change] created by refactoring may be unsafe,
-   * so we want user to review the [Change] to ensure that he understands it.
-   */
-  bool requiresPreview();
-}
-
-/**
- *
- *
- * Clients may implement this class when implementing plugins.
- */
-abstract class RefactoringContributor {
-  /**
-   *
-   */
-  Refactoring createRefactoring(AnalysisContext context, RefactoringKind kind,
-      Source source, int offset, int length);
-
-  /**
-   *
-   */
-  List<RefactoringKind> getAvailableRefactorings(
-      AnalysisContext context, Source source, int offset, int length);
-}
-
-/**
- *
- *
- * Clients may not extend, implement or mix-in this class.
- */
-abstract class RefactoringKind {
-  factory RefactoringKind(String name, bool requiresOptions) {
-    // TODO(brianwilkerson) Redirect to impl class.
-    return null;
-  }
-  bool get requiresOptions;
-}
-
-/**
- *
- *
- * Clients may not extend, implement or mix-in this class.
- */
-abstract class RefactoringStatus {
-  // TODO(brianwilkerson) Fill this in.
-}