Clarify type names in analysis server API.

pkg/analysis_server/test/analysis/get_errors_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.analysis.get_errors;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/protocol.dart';
@@ skipping 56 matching lines @@
   test_hasErrors() {
     addTestFile('''
 main() {
   print(42)
 }
 ''');
     return _getErrors(testFile).then((List<AnalysisError> errors) {
       expect(errors, hasLength(1));
       {
         AnalysisError error = errors[0];
-        expect(error.severity, ErrorSeverity.ERROR);
-        expect(error.type, ErrorType.SYNTACTIC_ERROR);
+        expect(error.severity, AnalysisErrorSeverity.ERROR);
+        expect(error.type, AnalysisErrorType.SYNTACTIC_ERROR);
         expect(error.location.file, testFile);
         expect(error.location.startLine, 2);
       }
     });
   }
 
   test_noErrors() {
     addTestFile('''
 main() {
   print(42);
@@ skipping 32 matching lines @@
     return new AnalysisGetErrorsParams(testFile).toRequest(requestId);
   }
 
   Future<List<AnalysisError>> _getErrors(String file) {
     Request request = _createGetErrorsRequest();
     return serverChannel.sendRequest(request).then((Response response) {
       return new AnalysisGetErrorsResult.fromResponse(response).errors;
     });
   }
 }