Move exception support to its own library

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 5f99c4434ba42777e09d5448e708ddcc357fb501..2c6e4100ad175e4639eed26cc25a1f070c6e4e06 100644
--- a/pkg/analyzer/test/src/task/html_work_manager_test.dart
+++ b/pkg/analyzer/test/src/task/html_work_manager_test.dart
@@ -4,6 +4,7 @@
 
 library analyzer.test.src.task.html_work_manager_test;
 
+import 'package:analyzer/exception/exception.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show
@@ -15,7 +16,6 @@ import 'package:analyzer/src/generated/engine.dart'
         InternalAnalysisContext;
 import 'package:analyzer/src/generated/error.dart'
     show AnalysisError, HtmlErrorCode;
-import 'package:analyzer/src/generated/java_engine.dart' show CaughtException;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/html.dart';
 import 'package:analyzer/src/task/html_work_manager.dart';