Deprecate old "isPotentiallyMutated..." API.

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index 21c2fd36d9b4e33b86f9aeec3ca4ce698935cc52..8df7837761dbc8c2d45e098050900d515f32fbf0 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -4069,8 +4069,6 @@ class ResolveVariableReferencesTaskTest extends _AbstractDartTaskTest {
    */
   void expectMutated(FunctionBody body, VariableElement variable,
       bool mutatedInClosure, bool mutatedInScope) {
-    expect(variable.isPotentiallyMutatedInClosure, mutatedInClosure);
-    expect(variable.isPotentiallyMutatedInScope, mutatedInScope);
     expect(body.isPotentiallyMutatedInClosure(variable), mutatedInClosure);
     expect(body.isPotentiallyMutatedInScope(variable), mutatedInScope);
   }