fix analysis messages

test/codegen/dom.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.
 
 library dom;
 
 class JsType {
   /// The JavaScript constructor function name.
   /// Used for construction and instanceof checks.
   /// Note that this could be an expression, e.g. `lib.TypeName` in JS, but it
   /// should be kept simple, as it will be generated directly into the code.
   final String name;
   const JsType({this.name});
 }
 class JsGlobal {
   const JsGlobal();
 }
 class Overload {
   const Overload();
 }
 const overload = const Overload();
 
-// TODO(jmesserly): uncomment once fix lands for:
-// https://github.com/dart-lang/dart_style/issues/85
-// @JsGlobal()
-final Document document;
+@JsGlobal()
+final Document document = null;
 
 @JsType(name: 'Document')
 abstract class Document {
   Element querySelector(String selector);
 }
 
 @JsType(name: 'Element')
 abstract class Element {
   void addEventListener(String type, EventListener callback, [bool capture]);
   String textContent;
@@ skipping 149 matching lines @@
 abstract class TextMetrics {
   num get width;
 }
 
 @JsType()
 abstract class ImageData {
   int get width;
   int get height;
   // TODO: readonly Uint8ClampedArray data;
 }