Merge analysis_testing package into analysis_server.

pkg/analysis_server/test/integration/analysis/overrides_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.integration.analysis.overrides;
 
-import 'package:analysis_testing/reflective_tests.dart';
+import '../../reflective_tests.dart';
 import 'package:unittest/unittest.dart';
 
 import '../integration_tests.dart';
 
 @ReflectiveTestCase()
 class Test extends AbstractAnalysisServerIntegrationTest {
   test_overrides() {
     String pathname = sourcePath('test.dart');
     String text =
         r'''
@@ skipping 93 matching lines @@
       checkOverrides('method5', false, ['Interface2']);
       checkOverrides('method6', true, []);
       checkOverrides('method7', false, []);
     });
   }
 }
 
 main() {
   runReflectiveTests(Test);
 }