Elements. Migrate ElementDescriptor.

Change-Id: I7b5d42c4302835ec35a5ab1e607e7b4b836e5a3c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/387461
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>

pkg/analysis_server/analyzer_use_new_elements.txt

@@ -525,3 +525,4 @@ lib/src/utilities/tee_string_sink.dart
 lib/src/utilities/usage_tracking/usage_tracking.dart
 lib/src/utilities/yaml_node_locator.dart
 lib/starter.dart
+lib/src/services/correction/fix/data_driven/element_descriptor.dart

pkg/analysis_server/lib/src/services/correction/fix/data_driven/element_descriptor.dart

@@ -4,7 +4,7 @@
 
 import 'package:analysis_server/src/services/correction/fix/data_driven/element_kind.dart';
 import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/element/element.dart' show InterfaceElement;
+import 'package:analyzer/dart/element/element2.dart';
 import 'package:analyzer/dart/element/type.dart';
 
 /// A description of an element.
@@ -139,9 +139,9 @@ class ElementDescriptor {
         } else {
           var type = target.staticType;
           if (type == null && target is SimpleIdentifier) {
-            var element = target.staticElement;
+            var element = target.element;
             // TODO(brianwilkerson): Handle more than `InterfaceElement`.
-            if (element is InterfaceElement) {
+            if (element is InterfaceElement2) {
               type = element.thisType;
             }
           }
@@ -151,11 +151,11 @@ class ElementDescriptor {
             return true;
           }
           if (type is InterfaceType) {
-            if (components[1] == type.element.name) {
+            if (components[1] == type.element3.name) {
               return true;
             }
             for (var supertype in type.allSupertypes) {
-              if (components[1] == supertype.element.name) {
+              if (components[1] == supertype.element3.name) {
                 return true;
               }
             }