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

pkg/analyzer/lib/src/generated/element_handle.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.
 
-// 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 engine.element_handle;
 
 import 'ast.dart';
 import 'element.dart';
 import 'engine.dart';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'resolver.dart';
 import 'source.dart';
 import 'utilities_dart.dart';
@@ skipping 1093 matching lines @@
   DartType get type => actualElement.type;
 }
 /**
  * TODO(scheglov) invalid implementation
  */
 class WeakReference<T> {
   final T value;
   WeakReference(this.value);
   T get() => value;
 }