Unify the server and plugin versions of the generators

pkg/analysis_server/test/services/completion/dart/label_contributor_test.dart

 // Copyright (c) 2015, 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 test.services.completion.contributor.dart.label;
-
-import 'package:analysis_server/plugin/protocol/protocol.dart' as protocol
-    show Element, ElementKind;
-import 'package:analysis_server/plugin/protocol/protocol.dart'
-    hide Element, ElementKind;
+import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/label_contributor.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'completion_contributor_util.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(LabelContributorTest);
     defineReflectiveTests(LabelContributorTest_Driver);
   });
 }
 
 @reflectiveTest
 class LabelContributorTest extends DartCompletionContributorTest {
   CompletionSuggestion assertSuggestLabel(String name,
       {int relevance: DART_RELEVANCE_DEFAULT,
       CompletionSuggestionKind kind: CompletionSuggestionKind.IDENTIFIER}) {
     CompletionSuggestion cs =
         assertSuggest(name, csKind: kind, relevance: relevance);
     expect(cs.returnType, isNull);
-    protocol.Element element = cs.element;
+    Element element = cs.element;
     expect(element, isNotNull);
     expect(element.flags, 0);
-    expect(element.kind, equals(protocol.ElementKind.LABEL));
+    expect(element.kind, equals(ElementKind.LABEL));
     expect(element.name, equals(name));
     expect(element.parameters, isNull);
     expect(element.returnType, isNull);
     assertHasNoParameterInfo(cs);
     return cs;
   }
 
   @override
   DartCompletionContributor createContributor() {
     return new LabelContributor();
@@ skipping 276 matching lines @@
     await computeSuggestions();
     assertSuggestLabel('foo');
   }
 }
 
 @reflectiveTest
 class LabelContributorTest_Driver extends LabelContributorTest {
   @override
   bool get enableNewAnalysisDriver => true;
 }