Rename the plugin location key and directory name

pkg/analysis_server/test/src/plugin/plugin_locator_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:analysis_server/src/plugin/plugin_locator.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 main() {
@@ skipping 58 matching lines @@
     pubspecPath = resourceProvider.pathContext
         .join(packageRoot, PluginLocator.pubspecFileName);
     resourceProvider.newFile(pubspecPath, content);
   }
 
   String _createPubspecWithKey() {
     String nonDefaultPath =
         resourceProvider.pathContext.join(packageRoot, 'pluginDir');
     _createPubspec('''
 name: test_project
-${PluginLocator.analysisPluginKey}: $nonDefaultPath
+${PluginLocator.analyzerPluginKey}: $nonDefaultPath
 ''');
     resourceProvider.newFolder(nonDefaultPath);
     return nonDefaultPath;
   }
 
   void _createPubspecWithoutKey() {
     _createPubspec('''
 name: test_project
 ''');
   }
 }