remove docgen source and targets from build

pkg/docgen/test/native_extensions_test.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 native_extensions_test;
-
-import 'dart:io';
-
-import 'package:path/path.dart' as path;
-import 'package:unittest/unittest.dart';
-
-import '../lib/src/exports/mirrors_util.dart' as dart2js_util;
-import '../lib/docgen.dart';
-
-const String DART_LIBRARY = '''
-  library sample_synchronous_extension;
-
-  import 'dart-ext:sample_extension';
-
-  // The simplest way to call native code: top-level functions.
-  int systemRand() native "SystemRand";
-  bool systemSrand(int seed) native "SystemSrand";
-
-  void main() {
-    systemRand();
-    systemSrand(4);
-  }
-''';
-
-main() {
-  group('Generate docs for', () {
-    test('file with native extensions.', () {
-      var temporaryDir = Directory.systemTemp.createTempSync('native_ext_');
-      var fileName = path.join(temporaryDir.path, 'temp.dart');
-      var file = new File(fileName);
-      file.writeAsStringSync(DART_LIBRARY);
-
-      return getMirrorSystem([new Uri.file(fileName)], false)
-        .then((mirrorSystem) {
-          var testLibraryUri = new Uri.file(path.absolute(fileName),
-                                            windows: Platform.isWindows);
-          var library = new Library(mirrorSystem.libraries[testLibraryUri]);
-          expect(library is Library, isTrue);
-
-          var classTypes = library.classes;
-          var classes = [];
-          classes.addAll(classTypes.values);
-          classes.addAll(library.errors.values);
-          expect(classes.every((e) => e is Class), isTrue);
-
-          expect(library.typedefs.values.every((e) => e is Typedef), isTrue);
-
-          var classMethodTypes = [];
-          classes.forEach((e) {
-            classMethodTypes.add(e.methods);
-            classMethodTypes.add(e.inheritedMethods);
-          });
-          expect(classMethodTypes.every((e) => e is Map<String, Method>),
-                 isTrue);
-
-          var classMethods = [];
-          classMethodTypes.forEach((e) {
-            classMethods.addAll(e.values);
-          });
-          expect(classMethods.every((e) => e is Method), isTrue);
-
-          var methodParameters = [];
-          classMethods.forEach((e) {
-            methodParameters.addAll(e.parameters.values);
-          });
-          expect(methodParameters.every((e) => e is Parameter), isTrue);
-
-          var functionTypes = library.functions;
-          expect(functionTypes is Map<String, Method>, isTrue);
-
-          var functions = [];
-          functions.addAll(functionTypes.values);
-          expect(functions.every((e) => e is Method), isTrue);
-
-          var functionParameters = [];
-          functions.forEach((e) {
-            functionParameters.addAll(e.parameters.values);
-          });
-          expect(functionParameters.every((e) => e is Parameter), isTrue);
-
-          var variables = library.variables.values;
-          expect(variables.every((e) => e is Variable), isTrue);
-
-          // Testing trying to refer to m1 function
-          var libraryDocComment =
-              library.fixReference('systemRand').children.first.text;
-          expect(libraryDocComment, 'sample_synchronous_extension.systemRand');
-
-          libraryDocComment =
-              library.fixReference('systemSrand').children.first.text;
-          expect(libraryDocComment, 'sample_synchronous_extension.systemSrand');
-        }).whenComplete(() => temporaryDir.deleteSync(recursive: true));
-    });
-  });
-}