Address a number of open issues.

lib/src/resource_loader.dart

 // Copyright (c) 2016, 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.
 
 import "dart:async" show Future, Stream;
 import "dart:convert" show Encoding;
 import "package_loader.dart";
 import "io_none.dart"
+    if (dart.library.html) "io_html.dart"
     if (dart.library.io) "io_io.dart"
-    if (dart.library.html) "io_html.dart"
     as io;
 
 /// Resource loading strategy.
 ///
 /// An abstraction of the functionality needed to load resources.
 ///
 /// Implementations of this interface decide which URI schemes they support.
 abstract class ResourceLoader {
   /// A resource loader that can load as many of the following URI
   /// schemes as are supported by the platform:
@@ skipping 41 matching lines @@
   const DefaultLoader();
 
   Stream<List<int>> openRead(Uri uri) => io.readAsStream(uri);
 
   Future<List<int>> readAsBytes(Uri uri) => io.readAsBytes(uri);
 
   Future<String> readAsString(Uri uri, {Encoding encoding}) =>
       io.readAsString(uri, encoding);
 }