Switch the default from non-driver to driver in several tests

pkg/analysis_server/test/services/search/search_engine_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.
 
 library test.services.src.search.search_engine_internal;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
@@ skipping 51 matching lines @@
     buffer.write(")");
     return buffer.toString();
   }
 }
 
 @reflectiveTest
 class SearchEngineImplTest extends AbstractSingleUnitTest {
   Index index;
   SearchEngineImpl searchEngine;
 
+  @override
+  bool get enableNewAnalysisDriver => false;
+
   void setUp() {
     super.setUp();
     index = createMemoryIndex();
     searchEngine =
         new SearchEngineImpl(index, (_) => new AstProviderForContext(context));
   }
 
   test_searchAllSubtypes() async {
     await _indexTestUnit('''
 class T {}
@@ skipping 862 matching lines @@
     List<SearchMatch> matches = await searchEngine.searchReferences(element);
     _assertMatches(matches, expectedMatches);
     expect(matches, hasLength(expectedMatches.length));
   }
 
   static void _assertMatches(
       List<SearchMatch> matches, List<ExpectedMatch> expectedMatches) {
     expect(matches, unorderedEquals(expectedMatches));
   }
 }