Dart SDK Spelling b, c, and d.

samples-dev/swarm/swarm_ui_lib/layout/GridLayout.dart

Index: samples-dev/swarm/swarm_ui_lib/layout/GridLayout.dart
diff --git a/samples-dev/swarm/swarm_ui_lib/layout/GridLayout.dart b/samples-dev/swarm/swarm_ui_lib/layout/GridLayout.dart
index 6b8638d449761ae10d3fb45450e2defadae6d371..3db8ceb5eab11725c4670ebe9f04acbcd5a88a00 100644
--- a/samples-dev/swarm/swarm_ui_lib/layout/GridLayout.dart
+++ b/samples-dev/swarm/swarm_ui_lib/layout/GridLayout.dart
@@ -14,7 +14,7 @@ part of layout;
  */
 // TODO(jmesserly): the DOM integration still needs work:
 //  - The grid assumes it is absolutely positioned in its container.
-//    Becasue of that, the grid doesn't work right unless it has at least one
+//    Because of that, the grid doesn't work right unless it has at least one
 //    fractional size in each dimension. In other words, only "top down" grids
 //    work at the moment, because the grid can't determine its own size.
 //    The core algorithm supports computing min breadth; the issue is about how