Format samples and samples-dev directories.

samples-dev/swarm/swarm_ui_lib/util/CollectionUtils.dart

Index: samples-dev/swarm/swarm_ui_lib/util/CollectionUtils.dart
diff --git a/samples-dev/swarm/swarm_ui_lib/util/CollectionUtils.dart b/samples-dev/swarm/swarm_ui_lib/util/CollectionUtils.dart
index 763738b6ae4997c24062a2a08ad83b421d676cee..60dd8eca668f5ad75b394e24edfd48db335d6fd0 100644
--- a/samples-dev/swarm/swarm_ui_lib/util/CollectionUtils.dart
+++ b/samples-dev/swarm/swarm_ui_lib/util/CollectionUtils.dart
@@ -11,10 +11,9 @@ typedef num NumericValueSelector<T>(T value);
  * TODO(jmesserly): make these top level functions?
  */
 class CollectionUtils {
-
   static void insertAt(List arr, int pos, value) {
-    assert (pos >= 0);
-    assert (pos <= arr.length);
+    assert(pos >= 0);
+    assert(pos <= arr.length);
 
     if (pos == arr.length) {
       arr.add(value);