rename completion constants and cleanup comment

pkg/analysis_server/lib/src/services/completion/arglist_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.arglist;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart' hide Element,
     ElementKind;
@@ skipping 167 matching lines @@
           }
           completion.write(name);
           paramNames.add(name);
           paramTypes.add(_getParamType(param));
         }
       }
     }
     completion.write(')');
     CompletionSuggestion suggestion = new CompletionSuggestion(
         CompletionSuggestionKind.ARGUMENT_LIST,
-        COMPLETION_RELEVANCE_HIGH,
+        DART_RELEVANCE_HIGH,
         completion.toString(),
         completion.length,
         0,
         false,
         false);
     suggestion.parameterNames = paramNames;
     suggestion.parameterTypes = paramTypes;
     request.suggestions.add(suggestion);
   }
 
   String _getParamType(FormalParameter param) {
     TypeName type;
     if (param is SimpleFormalParameter) {
       type = param.type;
     }
     if (type != null) {
       Identifier id = type.name;
       if (id != null) {
         String name = id.name;
         if (name != null && name.length > 0) {
           return name;
         }
       }
     }
     return 'dynamic';
   }
 }