Remove more libraries directives from server

pkg/analysis_server/lib/src/computer/computer_overrides.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.overrides;
-
 import 'package:analysis_server/src/collections.dart';
 import 'package:analysis_server/src/protocol_server.dart' as proto;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 
 /**
  * Return the elements that the given [element] overrides.
  */
 OverriddenElements findOverriddenElements(Element element) {
@@ skipping 213 matching lines @@
     if (_kinds.contains(ElementKind.SETTER)) {
       member = classElement.lookUpSetter(_name + '=', _library);
       if (member != null) {
         return member;
       }
     }
     // not found
     return null;
   }
 }