Make more use of generated code in analysis server.

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/constants.dart';
 import 'package:analysis_testing/mocks.dart';
@@ skipping 86 matching lines @@
         FILE: 'foo.dart',
         OFFSET: 10,
         LENGTH: 20,
         START_LINE: -1,
         START_COLUMN: -1
       },
       MESSAGE: 'my message'
     });
   }
 
-  void test_fromJson() {
-    var json = {
-      SEVERITY: 'ERROR',
-      TYPE: 'SYNTACTIC_ERROR',
-      LOCATION: {
-        FILE: '/test.dart',
-        OFFSET: 19,
-        LENGTH: 1,
-        START_LINE: 2,
-        START_COLUMN: 11
-      },
-      MESSAGE: 'Expected to find \';\'',
-      CORRECTION: 'my correction'
-    };
-    AnalysisError error =
-        new AnalysisError.fromJson(new ResponseDecoder(), 'json', json);
-    {
-      Location location = error.location;
-      expect(location.file, '/test.dart');
-      expect(location.offset, 19);
-      expect(location.length, 1);
-      expect(location.startLine, 2);
-      expect(location.startColumn, 11);
-    }
-    expect(error.message, "Expected to find ';'");
-    expect(error.severity, ErrorSeverity.ERROR);
-    expect(error.type, ErrorType.SYNTACTIC_ERROR);
-    expect(error.correction, "my correction");
-  }
-
   void test_engineErrorsToJson() {
     var json = engineErrorsToJson(lineInfo, [engineError]);
     expect(json, unorderedEquals([{
         'severity': 'ERROR',
         'type': 'COMPILE_TIME_ERROR',
         'location': {
           'file': 'foo.dart',
           'offset': 10,
           'length': 20,
           'startLine': 3,
           'startColumn': 2
         },
         'message': 'my message'
       }]));
   }
 }