Remove unnecessary hide clauses

pkg/analysis_server/lib/src/domain_diagnostic.dart

 // Copyright (c) 2015, 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 analysis_server.src.domain_diagnostic;
 
 import 'dart:collection';
-import 'dart:core' hide Resource;
+import 'dart:core';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/context/context.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_collection.dart';
 import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/task/model.dart';
@@ skipping 71 matching lines @@
       String requestName = request.method;
       if (requestName == DIAGNOSTICS) {
         return computeDiagnostics(request);
       }
     } on RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
 }