Make server use the common protocol classes

pkg/analysis_server/test/edit/format_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.edit.format;
-
 import 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/edit/edit_domain.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:plugin/manager.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../analysis_abstract.dart';
 import '../mocks.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(FormatTest);
@@ skipping 98 matching lines @@
   EditFormatResult _formatAt(int selectionOffset, int selectionLength,
       {int lineLength}) {
     Request request = new EditFormatParams(
             testFile, selectionOffset, selectionLength,
             lineLength: lineLength)
         .toRequest('0');
     Response response = handleSuccessfulRequest(request);
     return new EditFormatResult.fromResponse(response);
   }
 }