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

samples/swarm/swarm_ui_lib/layout/GridLayout.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;
 
 /**
  * Implements a grid-based layout system based on:
  * [http://dev.w3.org/csswg/css3-grid-align/]
  *
@@ skipping 214 matching lines @@
     }
 
     // Now, go through and round each position to an integer. Then
     // compute the sizes based on those integers.
     num finalPosition = position;
 
     for (int i = 0; i < tracks.length; i++) {
       int startEdge = tracks[i].start;
       int endEdge;
       if (i < tracks.length - 1) {
-        endEdge = tracks[i + 1].start.round().toInt();
+        endEdge = tracks[i + 1].start.round();
         tracks[i + 1].start = endEdge;
       } else {
-        endEdge = finalPosition.round().toInt();
+        endEdge = finalPosition.round();
       }
       int breadth = endEdge - startEdge;
 
       // check that we're not off by >= 1px.
       assert((endEdge - startEdge - tracks[i].usedBreadth).abs() < 1);
 
       tracks[i].usedBreadth = breadth;
     }
   }
 
@@ skipping 263 matching lines @@
     }
     return result;
   }
 
   int _getSpanCount(ViewLayout item) {
     GridLayoutParams childLayout = item.layoutParams;
     return (_dimension == Dimension.WIDTH ?
         childLayout.columnSpan : childLayout.rowSpan);
   }
 }