Update the plugin API

pkg/analyzer_plugin/test/utilities/navigation_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart' as driver;
 import 'package:analyzer_plugin/src/utilities/navigation/navigation.dart';
 import 'package:analyzer_plugin/utilities/generator.dart';
 import 'package:analyzer_plugin/utilities/navigation/navigation.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 void main() {
   defineReflectiveTests(NavigationGeneratorTest);
 }
 
 @reflectiveTest
 class NavigationGeneratorTest {
   MemoryResourceProvider provider = new MemoryResourceProvider();
 
   ResolveResult resolveResult = new driver.AnalysisResult(
       null, null, 'a.dart', null, true, '', null, '', null, null, null);
 
   test_none() {
     NavigationGenerator generator = new NavigationGenerator([]);
     NavigationRequest request =
-        new NavigationRequestImpl(provider, 0, 100, resolveResult);
+        new DartNavigationRequestImpl(provider, 0, 100, resolveResult);
     GeneratorResult result = generator.generateNavigationNotification(request);
     expect(result.notifications, hasLength(1));
   }
 
   test_normal() {
     TestContributor contributor = new TestContributor();
     NavigationGenerator generator = new NavigationGenerator([contributor]);
     NavigationRequest request =
-        new NavigationRequestImpl(provider, 0, 100, resolveResult);
+        new DartNavigationRequestImpl(provider, 0, 100, resolveResult);
     GeneratorResult result = generator.generateNavigationNotification(request);
     expect(result.notifications, hasLength(1));
     expect(contributor.count, 1);
   }
 
   /**
    * This tests that we get an error notification for each contributor that
    * throws an error and that an error in one contributor doesn't prevent other
    * contributors from being called.
    */
   test_withException() {
     TestContributor contributor1 = new TestContributor();
     TestContributor contributor2 = new TestContributor(throwException: true);
     TestContributor contributor3 = new TestContributor();
     TestContributor contributor4 = new TestContributor(throwException: true);
     NavigationGenerator generator = new NavigationGenerator(
         [contributor1, contributor2, contributor3, contributor4]);
     NavigationRequest request =
-        new NavigationRequestImpl(provider, 0, 100, resolveResult);
+        new DartNavigationRequestImpl(provider, 0, 100, resolveResult);
     GeneratorResult result = generator.generateNavigationNotification(request);
     expect(result.notifications, hasLength(3));
     expect(
         result.notifications.where(
             (notification) => notification.event == 'analysis.navigation'),
         hasLength(1));
     expect(
         result.notifications
             .where((notification) => notification.event == 'plugin.error'),
         hasLength(2));
@@ skipping 20 matching lines @@
 
   @override
   void computeNavigation(
       NavigationRequest request, NavigationCollector collector) {
     count++;
     if (throwException) {
       throw new Exception();
     }
   }
 }