Elements. Migrate FlutterTest.

Change-Id: Ia6f7cfb2e88c8790cdd5324727be154eec409979
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/394342
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: scheglov

pkg/analysis_server/analyzer_use_new_elements.txt

@@ -118,6 +118,5 @@ test/services/search/search_engine_test.dart
 test/src/cider/completion_test.dart
 test/src/cider/rename_test.dart
 test/src/services/completion/dart/suggestion_builder_test.dart
-test/src/utilities/flutter_test.dart
 test/src/utilities/selection_coverage_test.dart
 tool/code_completion/try_hypothesis.dart

pkg/analysis_server/test/src/utilities/flutter_test.dart

@@ -441,19 +441,20 @@ class MyContainer extends Container {}
 class NotFlutter {}
 class NotWidget extends State {}
 ''');
-    var myStatelessWidget = testUnitElement.getClass('MyStatelessWidget');
+
+    var myStatelessWidget = findElement2.class_('MyStatelessWidget');
     expect(myStatelessWidget.isWidget, isTrue);
 
-    var myStatefulWidget = testUnitElement.getClass('MyStatefulWidget');
+    var myStatefulWidget = findElement2.class_('MyStatefulWidget');
     expect(myStatefulWidget.isWidget, isTrue);
 
-    var myContainer = testUnitElement.getClass('MyContainer');
+    var myContainer = findElement2.class_('MyContainer');
     expect(myContainer.isWidget, isTrue);
 
-    var notFlutter = testUnitElement.getClass('NotFlutter');
+    var notFlutter = findElement2.class_('NotFlutter');
     expect(notFlutter.isWidget, isFalse);
 
-    var notWidget = testUnitElement.getClass('NotWidget');
+    var notWidget = findElement2.class_('NotWidget');
     expect(notWidget.isWidget, isFalse);
   }