rename completion constants and cleanup comment

pkg/analysis_server/lib/src/services/completion/imported_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.toplevel;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element,
@@ skipping 94 matching lines @@
     if (future != null) {
       return future.then(addSuggestions);
     }
     return addSuggestions(true);
   }
 
   /**
    * Add imported element suggestions.
    */
   void _addElementSuggestions(List<Element> elements, {int relevance:
-      COMPLETION_RELEVANCE_DEFAULT}) {
+      DART_RELEVANCE_DEFAULT}) {
     elements.forEach((Element elem) {
       if (elem is! ClassElement) {
         if (typesOnly) {
           return;
         }
         if (elem is ExecutableElement) {
           DartType returnType = elem.returnType;
           if (returnType != null && returnType.isVoid) {
             if (excludeVoidReturn) {
               return;
@@ skipping 65 matching lines @@
     }
 
     //TODO (danrubel) Revisit this filtering once paged API has been added
     addFilteredSuggestions(List<CompletionSuggestion> unfiltered) {
       unfiltered.forEach((CompletionSuggestion suggestion) {
         if (filterText.length > 0) {
           if (suggestion.completion.startsWith(filterText)) {
             request.suggestions.add(suggestion);
           }
         } else {
-          if (suggestion.relevance != COMPLETION_RELEVANCE_LOW) {
+          if (suggestion.relevance != DART_RELEVANCE_LOW) {
             request.suggestions.add(suggestion);
           }
         }
       });
     }
 
     DartCompletionCache cache = request.cache;
     addFilteredSuggestions(cache.importedTypeSuggestions);
     addFilteredSuggestions(cache.libraryPrefixSuggestions);
     if (!typesOnly) {
       addFilteredSuggestions(cache.otherImportedSuggestions);
       if (!excludeVoidReturn) {
         addFilteredSuggestions(cache.importedVoidReturnSuggestions);
       }
     }
   }
 }