Finish modifying analysis server to make use of code generation.

pkg/analysis_server/test/computer/error_test.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 test.computer.error;
 
 import 'package:analysis_server/src/computer/error.dart';
-import 'package:analysis_server/src/protocol2.dart';
+import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_testing/mocks.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:analyzer/src/generated/error.dart' as engine;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:typed_mock/typed_mock.dart';
 import 'package:unittest/unittest.dart';
 
 
 
@@ skipping 94 matching lines @@
           'file': 'foo.dart',
           'offset': 10,
           'length': 20,
           'startLine': 3,
           'startColumn': 2
         },
         'message': 'my message'
       }]));
   }
 }