Remove more tests which depend on dartdoc, which has been deleted.

tools/dom/docs/test/docs_test.dart

-// Copyright (c) 2013, 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 docs_test;
-
-import 'dart:io';
-
-import 'package:unittest/unittest.dart';
-import 'package:path/path.dart' as path;
-
-import '../bin/docs.dart';
-import '../lib/docs.dart';
-
-final testJsonPath = Platform.script.resolve('test.json').toFilePath();
-
-main() {
-  // Some tests take more than the default 20 second unittest timeout.
-  unittestConfiguration.timeout = null;
-  group('docs', () {
-    var oldJson = new File(json_path);
-    var testJson = new File(testJsonPath);
-
-    tearDown(() {
-      // Clean up.
-      if (testJson.existsSync()) {
-        testJson.deleteSync();
-      }
-      assert(!testJson.existsSync());
-    });
-
-    test('Ensure that docs.json is up to date', () {
-      // We should find a json file where we expect it.
-      expect(oldJson.existsSync(), isTrue);
-
-      // Save the last modified time to check it at the end.
-      var oldJsonModified = oldJson.lastModifiedSync();
-
-      // There should be no test file yet.
-      if (testJson.existsSync()) testJson.deleteSync();
-      assert(!testJson.existsSync());
-
-      expect(convert(lib_uri, testJsonPath)
-          .then((bool anyErrors) {
-        expect(anyErrors, isFalse);
-
-        // We should have a file now.
-        expect(testJson.existsSync(), isTrue);
-
-        // Ensure that there's nothing different between the new JSON and old.
-        expect(testJson.readAsStringSync(), equals(oldJson.readAsStringSync()));
-
-        // Ensure that the old JSON file didn't actually change.
-        expect(oldJsonModified, equals(oldJson.lastModifiedSync()));
-      }), completes);
-    });
-  });
-}