Revert "Move `analyzer_cli` into the SDK."

pkg/analyzer_cli/test/error_test.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.
-
-@TestOn("vm")
-
-library analyzer_cli.test.error;
-
-import 'package:test/test.dart';
-
-import 'utils.dart';
-
-void main() {
-  group('error', () {
-    test("a valid Dart file doesn't throw any errors", () {
-      expect(errorsForFile('void main() => print("Hello, world!");'), isNull);
-    });
-
-    test("an empty Dart file doesn't throw any errors", () {
-      expect(errorsForFile(''), isNull);
-    });
-
-    test("an error on the first line", () {
-      expect(errorsForFile('void foo;\n'), equals(
-          "Error in test.dart: Variables cannot have a type of 'void'\n"));
-    });
-
-    test("an error on the last line", () {
-      expect(errorsForFile('\nvoid foo;'), equals(
-          "Error in test.dart: Variables cannot have a type of 'void'\n"));
-    });
-
-    test("an error in the middle", () {
-      expect(errorsForFile('\nvoid foo;\n'), equals(
-          "Error in test.dart: Variables cannot have a type of 'void'\n"));
-    });
-
-    var veryLongString = new List.filled(107, ' ').join('');
-
-    test("an error at the end of a very long line", () {
-      expect(errorsForFile('$veryLongString     void foo;'), equals(
-          "Error in test.dart: Variables cannot have a type of 'void'\n"));
-    });
-
-    test("an error at the beginning of a very long line", () {
-      expect(errorsForFile('void foo;     $veryLongString'), equals(
-          "Error in test.dart: Variables cannot have a type of 'void'\n"));
-    });
-
-    test("an error in the middle of a very long line", () {
-      expect(errorsForFile('$veryLongString void foo;$veryLongString'), equals(
-          "Error in test.dart: Variables cannot have a type of 'void'\n"));
-    });
-  });
-}