Removed fixed dependencies

packages/analyzer/lib/src/plugin/plugin_configuration.dart

 // Copyright (c) 2015, 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.src.plugin.plugin_configuration;
 
 import 'package:analyzer/plugin/options.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:yaml/yaml.dart';
 
@@ skipping 66 matching lines @@
 /// A callback for error handling.
 typedef ErrorHandler(Exception e);
 
 /// Describes plugin configuration information as extracted from an
 /// analysis options map or plugin manifest.
 class PluginConfig {
   final Iterable<PluginInfo> plugins;
   PluginConfig(this.plugins);
 
   /// Create a plugin configuration from an options map.
-  factory PluginConfig.fromOptions(Map<String, YamlNode> options) {
+  factory PluginConfig.fromOptions(Map<String, Object> options) {
     List<PluginInfo> plugins = [];
     var analyzerOptions = options[_analyzerOptionScope];
     if (analyzerOptions != null) {
+      //TODO(pq): handle "raw" maps (https://github.com/dart-lang/sdk/issues/25126)
       if (analyzerOptions is YamlMap) {
         var pluginConfig = analyzerOptions[_pluginOptionScope];
         if (pluginConfig is YamlMap) {
           pluginConfig.forEach((name, details) {
             var plugin = _processPluginMapping(name, details);
             if (plugin != null) {
               plugins.add(plugin);
             }
           });
         } else {
@@ skipping 34 matching lines @@
   PluginConfig get config => _config;
 
   @override
   void onError(Exception exception) {
     if (_errorHandler != null) {
       _errorHandler(exception);
     }
   }
 
   @override
-  void optionsProcessed(
-      AnalysisContext context, Map<String, YamlNode> options) {
+  void optionsProcessed(AnalysisContext context, Map<String, Object> options) {
     _config = new PluginConfig.fromOptions(options);
   }
 }
 
 /// Describes plugin information.
 class PluginInfo {
   final String name;
   final String className;
   final String version;
   final String libraryUri;
@@ skipping 32 matching lines @@
 /// Provisional manifest file format:
 ///
 ///     class_name: MyAnalyzerPlugin
 ///     library_uri: 'my_plugin/my_analyzer_plugin.dart'
 ///     contributes_to: analyzer
 class PluginManifest {
   PluginInfo plugin;
   Iterable<String> contributesTo;
   PluginManifest({this.plugin, this.contributesTo});
 }