Finish modifying analysis server to make use of code generation.

pkg/analysis_server/lib/src/computer/error.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.
 
 library computer.error;
 
-import 'package:analysis_server/src/protocol2.dart';
+import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/engine.dart' as engine;
 import 'package:analyzer/src/generated/error.dart' as engine;
 import 'package:analyzer/src/generated/source.dart' as engine;
 
 
 /**
  * Returns a JSON correponding to the given list of Engine errors.
  */
 List<Map<String, Object>> engineErrorsToJson(engine.LineInfo lineInfo,
     List<engine.AnalysisError> errors) {
   return errors.map((engine.AnalysisError error) {
     return new AnalysisError.fromEngine(lineInfo, error).toJson();
   }).toList();
 }