Remove more calls to safelyVisit methods

pkg/analyzer/lib/src/dart/element/member.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.src.dart.element.member;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
@@ skipping 506 matching lines @@
   String getExtendedDisplayName(String shortName) =>
       _baseElement.getExtendedDisplayName(shortName);
 
   @override
   bool isAccessibleIn(LibraryElement library) =>
       _baseElement.isAccessibleIn(library);
 
   /**
    * If the given [child] is not `null`, use the given [visitor] to visit it.
    */
+  @deprecated
   void safelyVisitChild(Element child, ElementVisitor visitor) {
     // TODO(brianwilkerson) Make this private
     if (child != null) {
       child.accept(visitor);
     }
   }
 
   /**
    * Use the given [visitor] to visit all of the [children].
    */
@@ skipping 473 matching lines @@
     //    return getBaseElement().getInitializer();
   }
 
   @override
   bool get isConst => baseElement.isConst;
 
   @override
   bool get isFinal => baseElement.isFinal;
 
   @override
+  @deprecated
   bool get isPotentiallyMutatedInClosure =>
       baseElement.isPotentiallyMutatedInClosure;
 
   @override
+  @deprecated
   bool get isPotentiallyMutatedInScope =>
       baseElement.isPotentiallyMutatedInScope;
 
   @override
   bool get isStatic => baseElement.isStatic;
 
   @override
   void visitChildren(ElementVisitor visitor) {
     // TODO(brianwilkerson) We need to finish implementing the accessors used
     // below so that we can safely invoke them.
     super.visitChildren(visitor);
-    safelyVisitChild(baseElement.initializer, visitor);
+    baseElement.initializer?.accept(visitor);
   }
 }