Make ~/, round, ceil, floor, truncate return ints. Remove toInt.

samples/swarm/swarm_ui_lib/layout/ViewLayout.dart

 // Copyright (c) 2011, 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.
 
 part of layout;
 
 /** The interface that the layout algorithms use to talk to the view. */
 abstract class Positionable {
   ViewLayout get layout;
 
@@ skipping 211 matching lines @@
     }
   }
 
   static int _styleToPixels(String style, num size, num parentSize) {
     if (style == 'none') {
       // For an unset max-content size, use the actual size
       return size;
     }
     if (style.endsWith('%')) {
       num percent = double.parse(style.substring(0, style.length - 1));
-      return ((percent / 100) * parentSize).toInt();
+      return ((percent / 100) * parentSize).truncate();
     }
     return _toPixels(style);
   }
 }