Don't invalidate resolution for ClassElementDelta annotation changes.

pkg/analyzer/test/src/context/context_test.dart

 // Copyright (c) 2014, 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.test.src.context.context_test;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 2816 matching lines @@
     context.setContents(
         a,
         r'''
 @deprecated
 class A {}
 ''');
     _assertValidForChangedLibrary(a);
     _assertInvalid(a, LIBRARY_ERRORS_READY);
     _assertValidForDependentLibrary(b);
     _assertInvalid(b, LIBRARY_ERRORS_READY);
-    _assertInvalidUnits(b, RESOLVED_UNIT4);
+    _assertValidAllResolution(b);
     // Analysis is done successfully.
     _performPendingAnalysisTasks();
     _assertValid(a, LIBRARY_ERRORS_READY);
     _assertValid(a, READY_RESOLVED_UNIT);
     _assertValid(b, LIBRARY_ERRORS_READY);
     _assertValid(b, READY_RESOLVED_UNIT);
     expect(context.getErrors(b).errors, hasLength(1));
   }
 
   void test_class_annotation_remove_deprecated() {
@@ skipping 17 matching lines @@
     // is invalid.
     context.setContents(
         a,
         r'''
 class A {}
 ''');
     _assertValidForChangedLibrary(a);
     _assertInvalid(a, LIBRARY_ERRORS_READY);
     _assertValidForDependentLibrary(b);
     _assertInvalid(b, LIBRARY_ERRORS_READY);
-    _assertInvalidUnits(b, RESOLVED_UNIT4);
+    _assertValidAllResolution(b);
     // Analysis is done successfully.
     _performPendingAnalysisTasks();
     _assertValid(a, LIBRARY_ERRORS_READY);
     _assertValid(a, READY_RESOLVED_UNIT);
     _assertValid(b, LIBRARY_ERRORS_READY);
     _assertValid(b, READY_RESOLVED_UNIT);
     expect(context.getErrors(b).errors, hasLength(0));
   }
 
   void test_class_constructor_named_changeName() {
@@ skipping 2183 matching lines @@
    * Initialize the visitor.
    */
   _ElementGatherer();
 
   @override
   void visitElement(Element element) {
     elements[element] = element;
     super.visitElement(element);
   }
 }