Remove the non-driver versions of several tests

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/plugin/edit/assist/assist_dart.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
@@ skipping 13 matching lines @@
 import 'package:plugin/plugin.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../abstract_single_unit.dart';
 import 'flutter_util.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AssistProcessorTest);
-    defineReflectiveTests(AssistProcessorTest_Driver);
   });
 }
 
 @reflectiveTest
 class AssistProcessorTest extends AbstractSingleUnitTest {
   int offset;
   int length;
 
   ServerPlugin plugin;
   Assist assist;
   SourceChange change;
   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].
    */
   assertHasAssist(AssistKind kind, String expected) async {
     assist = await _assertHasAssist(kind);
     change = assist.change;
     // apply to "file"
     List<SourceFileEdit> fileEdits = change.edits;
     expect(fileEdits, hasLength(1));
@@ skipping 4652 matching lines @@
     offset = findOffset('/*caret*/') + '/*caret*/'.length;
     length = 0;
   }
 
   void _setStartEndSelection() {
     offset = findOffset('// start\n') + '// start\n'.length;
     length = findOffset('// end') - offset;
   }
 }
 
-@reflectiveTest
-class AssistProcessorTest_Driver extends AssistProcessorTest {
-  @override
-  bool get enableNewAnalysisDriver => true;
-}
-
 class _DartAssistContextForValues implements DartAssistContext {
   @override
   final Source source;
 
   @override
   final int selectionOffset;
 
   @override
   final int selectionLength;
 
   @override
   final AnalysisContext analysisContext;
 
   @override
   final AstProvider astProvider;
 
   @override
   final CompilationUnit unit;
 
   _DartAssistContextForValues(this.source, this.selectionOffset,
       this.selectionLength, this.analysisContext, this.astProvider, this.unit);
 }