Switch the default from non-driver to driver in several tests

pkg/analysis_server/test/services/correction/assist_test.dart

Index: pkg/analysis_server/test/services/correction/assist_test.dart
diff --git a/pkg/analysis_server/test/services/correction/assist_test.dart b/pkg/analysis_server/test/services/correction/assist_test.dart
index 2a3bac6dddadd87e7d811906c73ff942afab170a..886c3433d150369a2cd19299151796b72d254c3a 100644
--- a/pkg/analysis_server/test/services/correction/assist_test.dart
+++ b/pkg/analysis_server/test/services/correction/assist_test.dart
@@ -45,9 +45,6 @@ class AssistProcessorTest extends AbstractSingleUnitTest {
   String resultCode;
   LinkedEditGroup linkedPositionGroup;
 
-  @override
-  bool get enableNewAnalysisDriver => true;
-
   /**
    * Asserts that there is an [Assist] of the given [kind] at [offset] which
    * produces the [expected] code when applied to [testCode].