Merge the dart:uri library into dart:core and update the Uri class

utils/apidoc/html_diff.dart

 // Copyright (c) 2012, 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.
 
 /**
  * A script to assist in documenting the difference between the dart:html API
  * and the old DOM API.
  */
 library html_diff;
 
 import 'dart:async';
 import 'dart:io';
-import 'dart:uri';
 
 import 'lib/metadata.dart';
 
 // TODO(rnystrom): Use "package:" URL (#4968).
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirror.dart';
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_util.dart';
 import '../../sdk/lib/_internal/compiler/implementation/source_file_provider.dart';
 import '../../sdk/lib/_internal/dartdoc/lib/dartdoc.dart';
 import '../../sdk/lib/html/html_common/metadata.dart';
@@ skipping 201 matching lines @@
       return members;
     }
 
     if (name.split('.').length != 2) {
       warn('invalid member name ${name}');
       return new Set();
     }
     return new Set.from([name]);
   }
 }