Remove unused method and field from DartSdkManager

pkg/analyzer/test/src/context/builder_test.dart

 // Copyright (c) 2016, 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 analyzer.test.src.context.context_builder_test;
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/plugin/options.dart';
 import 'package:analyzer/src/context/builder.dart';
@@ skipping 64 matching lines @@
     String librariesFilePath = pathContext.join(defaultSdkPath, 'lib',
         '_internal', 'sdk_library_metadata', 'lib', 'libraries.dart');
     resourceProvider.newFile(
         librariesFilePath,
         r'''
 const Map<String, LibraryInfo> libraries = const {
   "async": const LibraryInfo("async/async.dart"),
   "core": const LibraryInfo("core/core.dart"),
 };
 ''');
-    sdkManager =
-        new DartSdkManager(defaultSdkPath, false, (_) => new MockSdk());
+    sdkManager = new DartSdkManager(defaultSdkPath, false);
     builder = new ContextBuilder(resourceProvider, sdkManager, contentCache);
   }
 
   void createFile(String path, String content) {
     resourceProvider.newFile(path, content);
   }
 
   @override
   void setUp() {
     resourceProvider = new MemoryResourceProvider();
     pathContext = resourceProvider.pathContext;
     new MockSdk(resourceProvider: resourceProvider);
     sdkManager =
-        new DartSdkManager(resourceProvider.convertPath('/sdk'), false, (_) {
-      fail('Should not be used to create an SDK');
-    });
+        new DartSdkManager(resourceProvider.convertPath('/sdk'), false);
     contentCache = new ContentCache();
     builder = new ContextBuilder(resourceProvider, sdkManager, contentCache);
   }
 
   @failingTest
   void test_buildContext() {
     fail('Incomplete test');
   }
 
   void test_convertPackagesToMap_noPackages() {
@@ skipping 626 matching lines @@
       fail('Unexpected invocation of optionsProcessed');
     }
     expect(options, hasLength(expectedOptions.length));
     for (String key in expectedOptions.keys) {
       expect(options.containsKey(key), isTrue, reason: 'missing key $key');
       expect(options[key], expectedOptions[key],
           reason: 'values for key $key do not match');
     }
   }
 }