[Gardening] Remove an invalid (and flaky) test

pkg/analysis_server/test/integration/analysis/get_errors.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 test.integration.analysis.get.errors;
-
-import 'dart:async';
-
-import 'package:test/test.dart';
-
-import '../integration_tests.dart';
-
-/**
- * Base class for testing the "analysis.getErrors" request.
- */
-class AnalysisDomainGetErrorsTest
-    extends AbstractAnalysisServerIntegrationTest {
-  /**
-   * True if the "analysis.getErrors" request should be made after analysis is
-   * complete.
-   */
-  final bool afterAnalysis;
-
-  AnalysisDomainGetErrorsTest(this.afterAnalysis);
-
-  test_getErrors() {
-    String pathname = sourcePath('test.dart');
-    String text = r'''
-main() {
-  var x // parse error: missing ';'
-}''';
-    writeFile(pathname, text);
-    standardAnalysisSetup();
-    Future finishTest() {
-      return sendAnalysisGetErrors(pathname).then((result) {
-        expect(result.errors, equals(currentAnalysisErrors[pathname]));
-      });
-    }
-    if (afterAnalysis) {
-      return analysisFinished.then((_) => finishTest());
-    } else {
-      return finishTest();
-    }
-  }
-}