Remove uses of configuration data

pkg/analyzer/lib/source/error_processor.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.source.error_processor;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/utilities_general.dart';
-import 'package:analyzer/src/task/options.dart'
-    show CONFIGURED_ERROR_PROCESSORS;
 import 'package:analyzer/src/task/options.dart';
 import 'package:yaml/yaml.dart';
 
 /// String identifiers mapped to associated severities.
 const Map<String, ErrorSeverity> severityMap = const {
   'error': ErrorSeverity.ERROR,
   'info': ErrorSeverity.INFO,
   'warning': ErrorSeverity.WARNING
 };
 
@@ skipping 68 matching lines @@
 
   /// Return an error processor associated with this [context] for the given
   /// [error], or `null` if none is found.
   static ErrorProcessor getProcessor(
       AnalysisContext context, AnalysisError error) {
     if (context == null) {
       return null;
     }
 
     // Let the user configure how specific errors are processed.
-    List<ErrorProcessor> processors =
-        context.getConfigurationData(CONFIGURED_ERROR_PROCESSORS);
+    List<ErrorProcessor> processors = context.analysisOptions.errorProcessors;
 
     // Give strong mode a chance to upgrade it.
     if (context.analysisOptions.strongMode) {
       processors = processors.toList();
       processors.add(_StrongModeTypeErrorProcessor.instance);
     }
     return processors.firstWhere((ErrorProcessor p) => p.appliesTo(error),
         orElse: () => null);
   }
 }
@@ skipping 15 matching lines @@
     ErrorCode errorCode = error.errorCode;
     if (errorCode is StaticTypeWarningCode) {
       return true;
     }
     if (errorCode is StaticWarningCode) {
       return errorCode.isStrongModeError;
     }
     return false;
   }
 }