Make server use the common protocol classes

pkg/analysis_server/test/timing/completion/completion_simple.dart

 // Copyright (c) 2014, 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 'dart:async';
 import 'dart:io';
 
-import 'package:analysis_server/protocol/protocol_generated.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:path/path.dart';
 
 import '../timing_framework.dart';
 
 /**
  * Perform the timing test, printing the minimum, average and maximum times, as
  * well as the standard deviation to the output.
  */
 void main(List<String> args) {
   SimpleTest test = new SimpleTest();
@@ skipping 83 matching lines @@
         {mainFilePath: new AddContentOverlay(originalContent)});
     return new Future.value();
   }
 
   @override
   Future tearDown() {
     sendAnalysisSetAnalysisRoots([], []);
     return new Future.value();
   }
 }