Remove dead code for an unused (old) task

pkg/analyzer/test/task/task_dart_test.dart

Index: pkg/analyzer/test/task/task_dart_test.dart
diff --git a/pkg/analyzer/test/task/task_dart_test.dart b/pkg/analyzer/test/task/task_dart_test.dart
deleted file mode 100644
index e7c03bec5bdec9565964f6669d4b27baec19b996..0000000000000000000000000000000000000000
--- a/pkg/analyzer/test/task/task_dart_test.dart
+++ /dev/null
@@ -1,118 +0,0 @@
-// 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 test.engine.task.dart;
-
-import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/java_engine.dart';
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
-import 'package:analyzer/src/task/task_dart.dart';
-import 'package:unittest/unittest.dart';
-
-import '../generated/engine_test.dart';
-import '../generated/resolver_test.dart';
-import '../generated/test_support.dart';
-
-main() {
-  groupSep = ' | ';
-//  runReflectiveTests(BuildUnitElementTaskTest);
-}
-
-class BuildUnitElementTaskTest extends EngineTestCase {
-  CompilationUnit parseUnit(
-      InternalAnalysisContext context, Source source, String content) {
-    ScanDartTask scanTask = new ScanDartTask(context, source, content);
-    scanTask.perform(new ScanDartTaskTestTV_accept());
-    ParseDartTask parseTask = new ParseDartTask(
-        context, source, scanTask.tokenStream, scanTask.lineInfo);
-    parseTask.perform(new ParseDartTaskTestTV_accept());
-    return parseTask.compilationUnit;
-  }
-
-  void test_accept() {
-    BuildUnitElementTask task =
-        new BuildUnitElementTask(null, null, null, null);
-    expect(task.accept(new BuildUnitElementTaskTV_accept()), isTrue);
-  }
-
-  void test_getException() {
-    BuildUnitElementTask task =
-        new BuildUnitElementTask(null, null, null, null);
-    expect(task.exception, isNull);
-  }
-
-  void test_getLibrarySource() {
-    Source source = new TestSource('/part.dart');
-    Source library = new TestSource('/lib.dart');
-    BuildUnitElementTask task =
-        new BuildUnitElementTask(null, source, library, null);
-    expect(task.library, equals(library));
-  }
-
-  void test_getUnitSource() {
-    Source source = new TestSource('/part.dart');
-    Source library = new TestSource('/lib.dart');
-    BuildUnitElementTask task =
-        new BuildUnitElementTask(null, source, library, null);
-    expect(task.source, equals(source));
-  }
-
-  void test_perform_exception() {
-    TestSource source = new TestSource();
-    source.generateExceptionOnRead = true;
-    InternalAnalysisContext context = AnalysisContextFactory.contextWithCore();
-    CompilationUnit unit = parseUnit(context, source, "");
-    BuildUnitElementTask task =
-        new BuildUnitElementTask(context, null, source, unit);
-    task.perform(new BuildUnitElementTaskTV_perform_exception());
-  }
-
-  void test_perform_valid() {
-    var content = """
-library lib;
-class A {}""";
-    Source source = new TestSource('/test.dart', content);
-    InternalAnalysisContext context = AnalysisContextFactory.contextWithCore();
-    CompilationUnit unit = parseUnit(context, source, content);
-    BuildUnitElementTask task =
-        new BuildUnitElementTask(context, source, source, unit);
-    task.perform(new BuildUnitElementTaskTV_perform_valid(source, unit));
-  }
-}
-
-class BuildUnitElementTaskTV_accept extends TestTaskVisitor<bool> {
-  @override
-  bool visitBuildUnitElementTask(BuildUnitElementTask task) => true;
-}
-
-class BuildUnitElementTaskTV_perform_exception extends TestTaskVisitor<bool> {
-  @override
-  bool visitBuildUnitElementTask(BuildUnitElementTask task) {
-    expect(task.exception, isNotNull);
-    return true;
-  }
-}
-
-class BuildUnitElementTaskTV_perform_valid extends TestTaskVisitor<bool> {
-  Source source;
-
-  CompilationUnit unit;
-
-  BuildUnitElementTaskTV_perform_valid(this.source, this.unit);
-
-  @override
-  bool visitBuildUnitElementTask(BuildUnitElementTask task) {
-    CaughtException exception = task.exception;
-    if (exception != null) {
-      throw exception;
-    }
-    expect(task.source, equals(source));
-    expect(task.library, equals(source));
-    expect(task.unit, equals(unit));
-    expect(task.unitElement, isNotNull);
-    return true;
-  }
-}