Remove the non-driver versions of several tests

pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart

Index: pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
index fe1e24b8ddb16b32ffc23605283d094a5a74e7f7..b1f507e98576353500df06ae054fd44762012c80 100644
--- a/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/library_member_contributor_test.dart
@@ -14,13 +14,15 @@ import 'completion_contributor_util.dart';
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(LibraryMemberContributorTest);
-    defineReflectiveTests(LibraryMemberContributorTest_Driver);
   });
 }
 
 @reflectiveTest
 class LibraryMemberContributorTest extends DartCompletionContributorTest {
   @override
+  bool get enableNewAnalysisDriver => true;
+
+  @override
   DartCompletionContributor createContributor() {
     return new LibraryMemberContributor();
   }
@@ -270,9 +272,3 @@ class LibraryMemberContributorTest extends DartCompletionContributorTest {
     assertNoSuggestions();
   }
 }
-
-@reflectiveTest
-class LibraryMemberContributorTest_Driver extends LibraryMemberContributorTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-}