move relevance computation from client to server

pkg/analysis_server/lib/src/services/completion/keyword_computer.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 services.completion.computer.dart.keyword;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 196 matching lines @@
             CompletionSuggestionKind.KEYWORD,
             relevance,
             completion,
             completion.length,
             0,
             false,
             false));
   }
 
   void _addSuggestions(List<Keyword> keywords, [int relevance =
-      COMPLETION_RELEVANCE_DEFAULT]) {
+      DART_RELEVANCE_KEYWORD]) {
     keywords.forEach((Keyword keyword) {
       _addSuggestion(keyword, relevance);
     });
   }
 
   bool _isOffsetAfterNode(AstNode node) {
     if (request.offset == node.end) {
       Token token = node.endToken;
       if (token != null && !token.isSynthetic) {
         if (token.lexeme == ';' || token.lexeme == '}') {
           return true;
         }
       }
     }
     return false;
   }
 }