Enable analysis driver in tests where possible

pkg/analysis_server/test/search/element_references_test.dart

Index: pkg/analysis_server/test/search/element_references_test.dart
diff --git a/pkg/analysis_server/test/search/element_references_test.dart b/pkg/analysis_server/test/search/element_references_test.dart
index 25a7b3fb9414178b95206e623e9a2b036cfb2117..068ccface236c9a83075d63c939f10fceffd6261 100644
--- a/pkg/analysis_server/test/search/element_references_test.dart
+++ b/pkg/analysis_server/test/search/element_references_test.dart
@@ -45,6 +45,12 @@ class ElementReferencesTest extends AbstractSearchDomainTest {
     expect(serverErrors, isEmpty);
   }
 
+  @override
+  void setUp() {
+    enableNewAnalysisDriver = false;
+    super.setUp();
+  }
+
   test_constructor_named() async {
     addTestFile('''
 class A {
@@ -680,6 +686,12 @@ class _NoSearchEngine extends AbstractSearchDomainTest {
     return null;
   }
 
+  @override
+  void setUp() {
+    enableNewAnalysisDriver = false;
+    super.setUp();
+  }
+
   test_requestError_noSearchEngine() async {
     addTestFile('''
 main() {