remove unused locals/members/test functions

pkg/analyzer/test/src/task/strong/strong_test_helper.dart

 // 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.
 
 // TODO(jmesserly): this file needs to be refactored, it's a port from
 // package:dev_compiler's tests
 library analyzer.test.src.task.strong.strong_test_helper;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 28 matching lines @@
     files = null;
   });
 }
 
 /// Adds a file using [addFile] and calls [check].
 void checkFile(String content) {
   addFile(content);
   check();
 }
 
-/// Adds [files] using [addFiles] and calls [check].
-void checkFiles(Map<String, String> files) {
-  addFiles(files);
-  check();
-}
-
 /// Adds a file to check. The file should contain:
 ///
 ///   * all expected failures are listed in the source code using comments
 ///     immediately in front of the AST node that should contain the error.
 ///
 ///   * errors are formatted as a token `level:Type`, where `level` is the
 ///     logging level were the error would be reported at, and `Type` is the
 ///     concrete subclass of [StaticInfo] that denotes the error.
 ///
 /// For example to check that an assignment produces a type error, you can
@@ skipping 478 matching lines @@
   UriKind get uriKind => UriKind.DART_URI;
 
   bool exists() => true;
 
   Source resolveRelative(Uri relativeUri) =>
       throw new UnsupportedError('not expecting relative urls in dart: mocks');
 
   Uri resolveRelativeUri(Uri relativeUri) =>
       throw new UnsupportedError('not expecting relative urls in dart: mocks');
 }