Break up another large file

pkg/analyzer/test/src/task/html_work_manager_test.dart

Index: pkg/analyzer/test/src/task/html_work_manager_test.dart
diff --git a/pkg/analyzer/test/src/task/html_work_manager_test.dart b/pkg/analyzer/test/src/task/html_work_manager_test.dart
index 2c6e4100ad175e4639eed26cc25a1f070c6e4e06..55698a09422da95d42c579a640620fbac27991f4 100644
--- a/pkg/analyzer/test/src/task/html_work_manager_test.dart
+++ b/pkg/analyzer/test/src/task/html_work_manager_test.dart
@@ -4,8 +4,10 @@
 
 library analyzer.test.src.task.html_work_manager_test;
 
+import 'package:analyzer/error/error.dart' show AnalysisError;
 import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/src/context/cache.dart';
+import 'package:analyzer/src/error/codes.dart' show HtmlErrorCode;
 import 'package:analyzer/src/generated/engine.dart'
     show
         AnalysisEngine,
@@ -14,8 +16,6 @@ import 'package:analyzer/src/generated/engine.dart'
         CacheState,
         ChangeNoticeImpl,
         InternalAnalysisContext;
-import 'package:analyzer/src/generated/error.dart'
-    show AnalysisError, HtmlErrorCode;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/html.dart';
 import 'package:analyzer/src/task/html_work_manager.dart';