Remove the old task model

pkg/analyzer/test/enum_test.dart

Index: pkg/analyzer/test/enum_test.dart
diff --git a/pkg/analyzer/test/enum_test.dart b/pkg/analyzer/test/enum_test.dart
index 706737f93d53a1e4ec225e68f588457a220070e4..378a9e67f19ed7dff2c420f3ca0933e7ad00d0cb 100644
--- a/pkg/analyzer/test/enum_test.dart
+++ b/pkg/analyzer/test/enum_test.dart
@@ -99,24 +99,12 @@ class EnumTest {
       ..check_explicit_values();
   }
 
-  void test_RetentionPriority() {
-    new EnumTester<RetentionPriority>()
-      ..check_getters()
-      ..check_explicit_values();
-  }
-
   void test_SourceKind() {
     new EnumTester<SourceKind>()
       ..check_getters()
       ..check_explicit_values();
   }
 
-  void test_SourcePriority() {
-    new EnumTester<SourcePriority>()
-      ..check_getters()
-      ..check_explicit_values();
-  }
-
   void test_UriKind() {
     new EnumTester<UriKind>()
       ..check_getters()