Enable analysis driver in tests where possible

pkg/analysis_server/test/search/top_level_declarations_test.dart

Index: pkg/analysis_server/test/search/top_level_declarations_test.dart
diff --git a/pkg/analysis_server/test/search/top_level_declarations_test.dart b/pkg/analysis_server/test/search/top_level_declarations_test.dart
index a155e0723662c8b1ea675c2131967200e5945833..22216a6b9d8143be9fa552f13c8b70210e5c5478 100644
--- a/pkg/analysis_server/test/search/top_level_declarations_test.dart
+++ b/pkg/analysis_server/test/search/top_level_declarations_test.dart
@@ -56,6 +56,12 @@ class TopLevelDeclarationsTest extends AbstractSearchDomainTest {
     return null;
   }
 
+  @override
+  void setUp() {
+    enableNewAnalysisDriver = true;
+    super.setUp();
+  }
+
   test_invalidRegex() async {
     var result = await findTopLevelDeclarations('[A');
     expect(result, new isInstanceOf<RequestError>());