Run 'Rename Library' refactoring tests with the new analysis driver.

pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart

Index: pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart
diff --git a/pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart b/pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart
index 486ee982830ba1f9e1e7e4612435ee2c24ba9257..a57c9888f782be85519ecab86303eec13e5ef357 100644
--- a/pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart
+++ b/pkg/analysis_server/test/services/refactoring/abstract_refactoring.dart
@@ -62,8 +62,7 @@ abstract class RefactoringTest extends AbstractSingleUnitTest {
     expect(fileEdit, isNotNull, reason: 'No file edit for $path');
     // validate resulting code
     File file = provider.getResource(path);
-    Source source = file.createSource();
-    String ini = context.getContents(source).data;
+    String ini = file.readAsStringSync();
     String actualCode = SourceEdit.applySequence(ini, fileEdit.edits);
     expect(actualCode, expectedCode);
   }