Remove Component.getRoot(), since we don't use it anymore.

sky/sdk/lib/framework/fn2.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library fn;
 
 import 'app.dart';
 import 'dart:async';
 import 'dart:collection';
 import 'dart:mirrors';
@@ skipping 870 matching lines @@
         fn();
   }
 
   void _didUnmount() {
     super._didUnmount();
     if (_unmountCallbacks != null)
       for (Function fn in _unmountCallbacks)
         fn();
   }
 
-  // TODO(rafaelw): It seems wrong to expose DOM at all. This is presently
-  // needed to get sizing info.
-  RenderObject getRoot() => root;
-
   void remove() {
     assert(_built != null);
     assert(root != null);
     removeChild(_built);
     _built = null;
     super.remove();
   }
 
   bool _willSync(UINode old) {
     assert(!_disqualifiedFromEverAppearingAgain);
@@ skipping 172 matching lines @@
     assert(root.parent is RenderView);
   }
 }
 
 class Text extends Component {
   Text(this.data) : super(key: '*text*');
   final String data;
   bool get interchangeable => true;
   UINode build() => new Paragraph(text: data);
 }