[analyzer] remove "auto-generated do not edit" comments

pkg/analyzer/test/generated/source_factory_test.dart

 // Copyright (c) 2015, 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.
 
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
 library analyzer.test.generated.source_factory;
 
 import 'dart:convert';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
 import 'package:analyzer/src/generated/java_core.dart';
 import 'package:analyzer/src/generated/java_engine_io.dart';
 import 'package:analyzer/src/generated/java_io.dart';
@@ skipping 325 matching lines @@
   UriResolver_SourceFactoryTest_test_fromEncoding_valid(this.encoding);
 
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     if (uri.toString() == encoding) {
       return new TestSource();
     }
     return null;
   }
 }