Remove the non-driver versions of several tests

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

Index: pkg/analysis_server/test/services/completion/dart/keyword_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/keyword_contributor_test.dart b/pkg/analysis_server/test/services/completion/dart/keyword_contributor_test.dart
index 48ee2b4a0d3c16b02552562ddd044f210d896ac2..7940276b51674b66f3e785dbd8735a6f84a0437f 100644
--- a/pkg/analysis_server/test/services/completion/dart/keyword_contributor_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/keyword_contributor_test.dart
@@ -14,7 +14,6 @@ import 'completion_contributor_util.dart';
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(KeywordContributorTest);
-    defineReflectiveTests(KeywordContributorTest_Driver);
   });
 }
 
@@ -212,6 +211,9 @@ class KeywordContributorTest extends DartCompletionContributorTest {
     Keyword.TRUE,
   ];
 
+  @override
+  bool get enableNewAnalysisDriver => true;
+
   void assertSuggestKeywords(Iterable<Keyword> expectedKeywords,
       {List<String> pseudoKeywords: NO_PSEUDO_KEYWORDS,
       int relevance: DART_RELEVANCE_KEYWORD}) {
@@ -1775,9 +1777,3 @@ class A {
     return true;
   }
 }
-
-@reflectiveTest
-class KeywordContributorTest_Driver extends KeywordContributorTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-}