Replace isAppropriateFor with suitabilityFor and start using it

pkg/analyzer/lib/task/yaml.dart

 // Copyright (c) 2016, 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 analyzer.task.yaml;
 
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:yaml/yaml.dart';
 
 /**
  * The result of parsing a YAML file.
  */
 final ResultDescriptor<YamlDocument> YAML_DOCUMENT =
     new ResultDescriptor<YamlDocument>('YAML_DOCUMENT', null);
 
 /**
  * The analysis errors associated with a [Source] representing a YAML file.
  */
 final ListResultDescriptor<AnalysisError> YAML_ERRORS =
     new ListResultDescriptor<AnalysisError>(
         'YAML_ERRORS', AnalysisError.NO_ERRORS);
-
-/**
- * The line information for a [Source].
- */
-final ResultDescriptor<LineInfo> YAML_LINE_INFO =
-    new ResultDescriptor<LineInfo>('YAML_LINE_INFO', null);