Stop using ExecutableElement.localVariables in RenameClassMemberRefactoringImpl.

pkg/analysis_server/lib/src/edit/edit_domain.dart

Index: pkg/analysis_server/lib/src/edit/edit_domain.dart
diff --git a/pkg/analysis_server/lib/src/edit/edit_domain.dart b/pkg/analysis_server/lib/src/edit/edit_domain.dart
index d60d677649e0f8c13437e97d2a65fadf493a88a1..13c0ebdeaa2b7d98630ddcc1131eed4a1b6b9320 100644
--- a/pkg/analysis_server/lib/src/edit/edit_domain.dart
+++ b/pkg/analysis_server/lib/src/edit/edit_domain.dart
@@ -830,8 +830,8 @@ class _RefactoringManager {
       CompilationUnit unit = await server.getResolvedCompilationUnit(file);
       if (unit != null) {
         _resetOnAnalysisStarted();
-        refactoring =
-            new ExtractMethodRefactoring(searchEngine, unit, offset, length);
+        refactoring = new ExtractMethodRefactoring(
+            searchEngine, server.getAstProvider(file), unit, offset, length);
         feedback = new ExtractMethodFeedback(offset, length, '', <String>[],
             false, <RefactoringMethodParameter>[], <int>[], <int>[]);
       }