Remove an unused request and the associated type

pkg/analyzer_plugin/test/plugin/plugin_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/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer_plugin/protocol/protocol.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:analyzer_plugin/protocol/protocol_generated.dart';
@@ skipping 82 matching lines @@
   test_handleAnalysisReanalyze_subset() async {
     await plugin.handleAnalysisSetContextRoots(
         new AnalysisSetContextRootsParams([contextRoot1]));
     await plugin.handleAnalysisSetContextRoots(
         new AnalysisSetContextRootsParams([contextRoot2]));
     var result = await plugin.handleAnalysisReanalyze(
         new AnalysisReanalyzeParams(roots: [packagePath2]));
     expect(result, isNotNull);
   }
 
-  @failingTest
-  test_handleAnalysisSetContextBuilderOptions() async {
-    var result = await plugin.handleAnalysisSetContextBuilderOptions(
-        new AnalysisSetContextBuilderOptionsParams(
-            new ContextBuilderOptions()));
-    expect(result, isNotNull);
-  }
-
   test_handleAnalysisSetContextRoots() async {
     var result = await plugin.handleAnalysisSetContextRoots(
         new AnalysisSetContextRootsParams([contextRoot1]));
     expect(result, isNotNull);
     AnalysisDriverGeneric driver = _getDriver(contextRoot1);
     expect(driver, isNotNull);
     expect((driver as MockAnalysisDriver).addedFiles, hasLength(1));
   }
 
   test_handleAnalysisSetPriorityFiles() async {
@@ skipping 167 matching lines @@
   test_onRequest_analysisReanalyze_subset() async {
     await channel
         .sendRequest(new AnalysisSetContextRootsParams([contextRoot1]));
     await channel
         .sendRequest(new AnalysisSetContextRootsParams([contextRoot2]));
     var result = await channel
         .sendRequest(new AnalysisReanalyzeParams(roots: [packagePath2]));
     expect(result, isNotNull);
   }
 
-  test_onRequest_analysisSetContextBuilderOptions() async {
-    var result = await channel.sendRequest(
-        new AnalysisSetContextBuilderOptionsParams(
-            new ContextBuilderOptions()));
-    expect(result, isNotNull);
-  }
-
   test_onRequest_analysisSetContextRoots() async {
     var result = await channel
         .sendRequest(new AnalysisSetContextRootsParams([contextRoot1]));
     expect(result, isNotNull);
     AnalysisDriverGeneric driver = _getDriver(contextRoot1);
     expect(driver, isNotNull);
     expect((driver as MockAnalysisDriver).addedFiles, hasLength(1));
   }
 
   test_onRequest_analysisSetPriorityFiles() async {
@@ skipping 113 matching lines @@
 
   _TestServerPlugin(ResourceProvider resourceProvider)
       : super(resourceProvider);
 
   @override
   void sendNotificationsForSubscriptions(
       Map<String, List<AnalysisService>> subscriptions) {
     latestSubscriptions = subscriptions;
   }
 }