Remove ExecutableElement.localVariables altogether.

pkg/analyzer/lib/src/fasta/mock_element.dart

Index: pkg/analyzer/lib/src/fasta/mock_element.dart
diff --git a/pkg/analyzer/lib/src/fasta/mock_element.dart b/pkg/analyzer/lib/src/fasta/mock_element.dart
index 07bd29decac4d958a792c1d572adad955d769678..93f787367e8348c28b2facbcfef5a7aefc0b1091 100644
--- a/pkg/analyzer/lib/src/fasta/mock_element.dart
+++ b/pkg/analyzer/lib/src/fasta/mock_element.dart
@@ -112,10 +112,6 @@ abstract class MockElement extends Builder implements Element, LocalElement {
 
   List<LabelElement> get labels => internalError("not supported.");
 
-  List<LocalVariableElement> get localVariables {
-    return internalError("not supported.");
-  }
-
   get visibleRange => internalError("not supported.");
 
   bool get hasImplicitType => internalError("not supported.");